diff --git a/Changelog.md b/Changelog.md
index 89a73fd74..356c73591 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -29,6 +29,7 @@ Ruby 2.0 is no longer officially supported.
 * Destroy Participation when removing interactions with a post [#5852](https://github.com/diaspora/diaspora/pull/5852)
 
 ## Features
+* Support color themes [#6033](https://github.com/diaspora/diaspora/pull/6033)
 
 # 0.5.1.0
 
diff --git a/app/assets/stylesheets/application.scss b/app/assets/stylesheets/_application.scss
similarity index 92%
rename from app/assets/stylesheets/application.scss
rename to app/assets/stylesheets/_application.scss
index abff7dda9..13e67f3d2 100644
--- a/app/assets/stylesheets/application.scss
+++ b/app/assets/stylesheets/_application.scss
@@ -1,6 +1,4 @@
-/* variables */
-@import 'bootstrap-variables'; // our overwrites
-@import 'bootstrap/variables'; // the original bootstrap ones
+@import "bootstrap-complete.scss";
 
 @import 'perfect-scrollbar';
 
diff --git a/app/assets/stylesheets/_mixins.scss b/app/assets/stylesheets/_mixins.scss
index e0181f1ba..0b01ca6bd 100644
--- a/app/assets/stylesheets/_mixins.scss
+++ b/app/assets/stylesheets/_mixins.scss
@@ -21,6 +21,9 @@ $default-border-radius: 3px;
   @include linear-gradient(lighten($color,20%), darken($color,15%));
 }
 
+@mixin header-gradient($color) {
+  @include linear-gradient(lighten($color, 2%), darken($color, 2%), 0%, 80%);
+}
 
 @mixin linear-gradient($from, $to, $start:0%, $end:100%){
   background: mix($from,$to);
diff --git a/app/assets/stylesheets/bootstrap-complete.scss b/app/assets/stylesheets/bootstrap-complete.scss
index 8f57874aa..5319f637a 100644
--- a/app/assets/stylesheets/bootstrap-complete.scss
+++ b/app/assets/stylesheets/bootstrap-complete.scss
@@ -1,4 +1,4 @@
 // Calling this file bootstrap would cause an infinite recursion during asset compilation.
 @import "bootstrap-sprockets";
-@import "bootstrap-variables";
+@import "bootstrap-variables"; //our overwrites of bootstrap variables
 @import "bootstrap";
diff --git a/app/assets/stylesheets/color_themes/_color_theme_override.scss b/app/assets/stylesheets/color_themes/_color_theme_override.scss
new file mode 100644
index 000000000..d21280f41
--- /dev/null
+++ b/app/assets/stylesheets/color_themes/_color_theme_override.scss
@@ -0,0 +1,77 @@
+/* Raw CSS */
+body {
+  header {
+    .container {
+      #nav_badges > #notification_dropdown {
+        a#mark_all_read_link, .stream_element a {
+          color: $link-color;
+        }
+
+        div.view_all {
+          background-color: $main-color;
+        }
+      }
+
+      #global_search > form > input.ac_input {
+        background-color: $header-search-color;
+        border-color: $main-color-dark;
+
+        &:hover {
+          background-color: lighten($header-search-color, 2%);
+        }
+
+        &:focus {
+          background-color: white;
+        }
+      }
+
+      ul#user_menu.active {
+        box-shadow: 0 1px 3px $main-color-dark;
+        background-color: $main-color-dark;
+
+        li {
+          border-color: darken($main-color-dark, 5%);
+
+          &.user-menu-item a:hover {
+            background-color: lighten($main-color-dark, 15%);
+          }
+        }
+      }
+    }
+  }
+
+  a,
+  a.tag,
+  .btn-link,
+  #main_stream .stream_element > .media a.author-name,
+  #hovercard h4 a,
+  .stream_element .from a.self {
+    color: $link-color;
+
+    &:hover, &:focus {
+      color: darken($link-color, 10%);
+    }
+  }
+
+  #publisher_textarea_wrapper > #button_container > span.markdownIndications > a {
+    color: fade-out($link-color, 0.4);
+  }
+
+
+  #main_stream .stream_element {
+    &.post_preview {
+      background-color: $main-color-essence;
+      border-color: darken($main-color-essence, 5%);
+    }
+  }
+
+  #leftNavBar .hoverable:hover { background-color: $main-color-essence }
+
+  .poll_form .progress .bar { background-color: $main-color-dark }
+
+  #profile_container .profile_header #profile_horizontal_bar ul#profile_nav > li.active {
+    border-bottom-color: $main-color;
+  }
+
+  .badge { background-color: $main-color }
+}
diff --git a/app/assets/stylesheets/color_themes/dark_green/_style.scss b/app/assets/stylesheets/color_themes/dark_green/_style.scss
new file mode 100644
index 000000000..6039cc718
--- /dev/null
+++ b/app/assets/stylesheets/color_themes/dark_green/_style.scss
@@ -0,0 +1,17 @@
+/* Main color(s) */
+$main-color: #009900;
+
+/* Shades */
+$main-color-essence: fade-out($main-color, 0.8);
+$main-color-light: lighten($main-color, 10%);
+$main-color-dark: darken($main-color, 20%);
+
+/* Bootstrap Variables */
+$btn-primary-bg: $main-color;
+$link-color: $main-color;
+
+/* Custom Variables */
+$header-background-color: $main-color-dark;
+$header-search-color: lighten($header-background-color, 10%);
+
+@import "color_themes/color_theme_override"
diff --git a/app/assets/stylesheets/color_themes/dark_green/desktop.scss b/app/assets/stylesheets/color_themes/dark_green/desktop.scss
new file mode 100644
index 000000000..fc325a510
--- /dev/null
+++ b/app/assets/stylesheets/color_themes/dark_green/desktop.scss
@@ -0,0 +1,2 @@
+@import "style";
+@import "application";
diff --git a/app/assets/stylesheets/color_themes/dark_green/mobile.scss b/app/assets/stylesheets/color_themes/dark_green/mobile.scss
new file mode 100644
index 000000000..e8a543736
--- /dev/null
+++ b/app/assets/stylesheets/color_themes/dark_green/mobile.scss
@@ -0,0 +1,2 @@
+@import "style";
+@import "mobile/mobile";
diff --git a/app/assets/stylesheets/color_themes/egyptian_blue/_style.scss b/app/assets/stylesheets/color_themes/egyptian_blue/_style.scss
new file mode 100644
index 000000000..c39132caa
--- /dev/null
+++ b/app/assets/stylesheets/color_themes/egyptian_blue/_style.scss
@@ -0,0 +1,17 @@
+/* Main color(s) */
+$main-color: #1034A6;
+
+/* Shades */
+$main-color-essence: fade-out($main-color, 0.8);
+$main-color-light: lighten($main-color, 10%);
+$main-color-dark: darken($main-color, 15%);
+
+/* Bootstrap Variables */
+$btn-primary-bg: $main-color;
+$link-color: $main-color;
+
+/* Custom Variables */
+$header-background-color: $main-color-dark;
+$header-search-color: lighten($header-background-color, 15%);
+
+@import "color_themes/color_theme_override"
diff --git a/app/assets/stylesheets/color_themes/egyptian_blue/desktop.scss b/app/assets/stylesheets/color_themes/egyptian_blue/desktop.scss
new file mode 100644
index 000000000..fc325a510
--- /dev/null
+++ b/app/assets/stylesheets/color_themes/egyptian_blue/desktop.scss
@@ -0,0 +1,2 @@
+@import "style";
+@import "application";
diff --git a/app/assets/stylesheets/color_themes/egyptian_blue/mobile.scss b/app/assets/stylesheets/color_themes/egyptian_blue/mobile.scss
new file mode 100644
index 000000000..e8a543736
--- /dev/null
+++ b/app/assets/stylesheets/color_themes/egyptian_blue/mobile.scss
@@ -0,0 +1,2 @@
+@import "style";
+@import "mobile/mobile";
diff --git a/app/assets/stylesheets/color_themes/magenta/_style.scss b/app/assets/stylesheets/color_themes/magenta/_style.scss
new file mode 100644
index 000000000..8b13dc77f
--- /dev/null
+++ b/app/assets/stylesheets/color_themes/magenta/_style.scss
@@ -0,0 +1,17 @@
+/* Main color(s) */
+$main-color: #FF00FF;
+
+/* Shades */
+$main-color-essence: fade-out($main-color, 0.8);
+$main-color-light: lighten($main-color, 10%);
+$main-color-dark: darken($main-color, 30%);
+
+/* Bootstrap Variables */
+$btn-primary-bg: darken($main-color, 5%);
+$link-color: $main-color;
+
+/* Custom Variables */
+$header-background-color: $main-color-dark;
+$header-search-color: lighten($header-background-color, 10%);
+
+@import "color_themes/color_theme_override"
diff --git a/app/assets/stylesheets/color_themes/magenta/desktop.scss b/app/assets/stylesheets/color_themes/magenta/desktop.scss
new file mode 100644
index 000000000..fc325a510
--- /dev/null
+++ b/app/assets/stylesheets/color_themes/magenta/desktop.scss
@@ -0,0 +1,2 @@
+@import "style";
+@import "application";
diff --git a/app/assets/stylesheets/color_themes/magenta/mobile.scss b/app/assets/stylesheets/color_themes/magenta/mobile.scss
new file mode 100644
index 000000000..e8a543736
--- /dev/null
+++ b/app/assets/stylesheets/color_themes/magenta/mobile.scss
@@ -0,0 +1,2 @@
+@import "style";
+@import "mobile/mobile";
diff --git a/app/assets/stylesheets/color_themes/original/_style.scss b/app/assets/stylesheets/color_themes/original/_style.scss
new file mode 100644
index 000000000..89dda9ca2
--- /dev/null
+++ b/app/assets/stylesheets/color_themes/original/_style.scss
@@ -0,0 +1,8 @@
+/* Main color(s) */
+$main-color: #585858;
+
+/* Shades */
+$main-color-dark: darken($main-color, 15%);
+
+/* Variables */
+$header-background-color: $main-color-dark;
diff --git a/app/assets/stylesheets/color_themes/original/desktop.scss b/app/assets/stylesheets/color_themes/original/desktop.scss
new file mode 100644
index 000000000..fc325a510
--- /dev/null
+++ b/app/assets/stylesheets/color_themes/original/desktop.scss
@@ -0,0 +1,2 @@
+@import "style";
+@import "application";
diff --git a/app/assets/stylesheets/color_themes/original/mobile.scss b/app/assets/stylesheets/color_themes/original/mobile.scss
new file mode 100644
index 000000000..e8a543736
--- /dev/null
+++ b/app/assets/stylesheets/color_themes/original/mobile.scss
@@ -0,0 +1,2 @@
+@import "style";
+@import "mobile/mobile";
diff --git a/app/assets/stylesheets/header.scss b/app/assets/stylesheets/header.scss
index df37965da..cbafb6364 100644
--- a/app/assets/stylesheets/header.scss
+++ b/app/assets/stylesheets/header.scss
@@ -4,8 +4,8 @@
 }
 
 body > header {
+  @include header-gradient($header-background-color);
   box-shadow: 0 1px 3px rgba(0,0,0,0.9);
-  background: image-url('header-bg.png') rgb(40,35,35);
   z-index: 1001;
   padding: 6px 0;
   color: #CCC;
@@ -15,7 +15,7 @@ body > header {
   min-width: 620px;
   top: 0;
   left: 0;
-  border-bottom: 1px solid #000;
+  border-bottom: 1px solid darken($header-background-color, 8%);
 
   > div > div.container {
     height: 26px;
diff --git a/app/assets/stylesheets/mobile/header.scss b/app/assets/stylesheets/mobile/header.scss
index 2a78a2f67..06c4073e8 100644
--- a/app/assets/stylesheets/mobile/header.scss
+++ b/app/assets/stylesheets/mobile/header.scss
@@ -8,9 +8,9 @@ header {
   height: 45px;
   top: 0px;
   z-index: 10;
-  background: image-url('header-bg-long.jpg') rgb(40,35,35);
+  @include header-gradient($header-background-color);
   box-shadow: 0 1px 2px #333;
-  border-bottom: 1px solid #222;
+  border-bottom: 1px solid darken($header-background-color, 8%);
 }
 
 #main_nav {
diff --git a/app/assets/stylesheets/mobile/mobile.scss b/app/assets/stylesheets/mobile/mobile.scss
index 925b45410..81adb2b12 100644
--- a/app/assets/stylesheets/mobile/mobile.scss
+++ b/app/assets/stylesheets/mobile/mobile.scss
@@ -917,7 +917,7 @@ form#update_profile_form {
   .submit_block { margin-bottom: 20px; }
 }
 
-select#user_language, #user_auto_follow_back_aspect_id, #aspect_ids_ {
+select#user_language, select#user_color_theme, #user_auto_follow_back_aspect_id, #aspect_ids_ {
   padding: 3px;
 }
 
diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index eaa03b62b..f929728ae 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -69,6 +69,12 @@ class UsersController < ApplicationController
         else
           flash[:error] = I18n.t 'users.update.follow_settings_not_changed'
         end
+      elsif u[:color_theme]
+        if @user.update_attributes(u)
+          flash[:notice] = I18n.t "users.update.color_theme_changed"
+        else
+          flash[:error] = I18n.t "users.update.color_theme_not_changed"
+        end
       end
     end
     set_email_preferences
@@ -181,6 +187,7 @@ class UsersController < ApplicationController
       :password,
       :password_confirmation,
       :language,
+      :color_theme,
       :disable_mail,
       :invitation_service,
       :invitation_identifier,
diff --git a/app/helpers/layout_helper.rb b/app/helpers/layout_helper.rb
index 8c2a45011..359127ae2 100644
--- a/app/helpers/layout_helper.rb
+++ b/app/helpers/layout_helper.rb
@@ -45,8 +45,8 @@ module LayoutHelper
     end
   end
 
-  def include_base_css_framework
-    stylesheet_link_tag('bootstrap-complete')
+  def include_color_theme(view="desktop")
+    stylesheet_link_tag "#{current_color_theme}/#{view}", media: "all"
   end
 
   def old_browser_js_support
diff --git a/app/helpers/users_helper.rb b/app/helpers/users_helper.rb
index 0b81a4a3d..d79b6b059 100644
--- a/app/helpers/users_helper.rb
+++ b/app/helpers/users_helper.rb
@@ -6,4 +6,39 @@ module UsersHelper
   def owner_image_link
     person_image_link(current_user.person, :size => :thumb_small)
   end
+
+  # Returns the path of the current color theme so that it
+  # can be loaded in app/views/layouts/application.html.haml
+  # and app/views/layouts/application.mobile.haml. If the user
+  # is not signed in or has not specified a color theme, the
+  # default (original) color theme is loaded.
+  #
+  # @example if user is not signed in
+  #   current_color_theme #=> "color_themes/original"
+  # @example if user Alice has not selected a color theme
+  #   current_color_theme #=> "color_themes/original"
+  # @example if user Alice has selected a "magenta" theme
+  #   current_color_theme #=> "color_themes/magenta"
+  def current_color_theme
+    if user_signed_in?
+      color_theme = current_user.color_theme
+    end
+    color_theme ||= AppConfig.settings.default_color_theme
+    "color_themes/#{color_theme}"
+  end
+
+  # Returns an array of the color themes available, as
+  # specified from AVAILABLE_COLOR_THEMES in
+  # config/initializers/color_themes.rb.
+  #
+  # @example if AVAILABLE_COLOR_THEMES = {"original"=>"Original dark", "dark_green" => "Dark green"}
+  #   available_color_themes
+  #   #=> [["Original dark", "original"], ["Dark green", "dark_green"]]
+  def available_color_themes
+    opts = []
+    AVAILABLE_COLOR_THEMES.map do |theme_code, theme_name|
+      opts << [theme_name, theme_code]
+    end
+    opts
+  end
 end
diff --git a/app/models/user.rb b/app/models/user.rb
index 8e569df21..e7685cd6e 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -23,12 +23,14 @@ class User < ActiveRecord::Base
 
   before_validation :strip_and_downcase_username
   before_validation :set_current_language, :on => :create
+  before_validation :set_default_color_theme, on: :create
 
   validates :username, :presence => true, :uniqueness => true
   validates_format_of :username, :with => /\A[A-Za-z0-9_]+\z/
   validates_length_of :username, :maximum => 32
   validates_exclusion_of :username, :in => AppConfig.settings.username_blacklist
   validates_inclusion_of :language, :in => AVAILABLE_LANGUAGE_CODES
+  validates :color_theme, inclusion: {in: AVAILABLE_COLOR_THEME_CODES}, allow_blank: true
   validates_format_of :unconfirmed_email, :with  => Devise.email_regexp, :allow_blank => true
 
   validates_presence_of :person, :unless => proc {|user| user.invitation_token.present?}
@@ -198,6 +200,10 @@ class User < ActiveRecord::Base
     self.language = I18n.locale.to_s if self.language.blank?
   end
 
+  def set_default_color_theme
+    self.color_theme ||= AppConfig.settings.default_color_theme
+  end
+
   # This override allows a user to enter either their email address or their username into the username field.
   # @return [User] The user that matches the username/email condition.
   # @return [nil] if no user matches that condition.
@@ -428,6 +434,8 @@ class User < ActiveRecord::Base
     self.email = opts[:email]
     self.language = opts[:language]
     self.language ||= I18n.locale.to_s
+    self.color_theme = opts[:color_theme]
+    self.color_theme ||= AppConfig.settings.default_color_theme
     self.valid?
     errors = self.errors
     errors.delete :person
diff --git a/app/views/layouts/application.html.haml b/app/views/layouts/application.html.haml
index e40ee1abd..d0789c988 100644
--- a/app/views/layouts/application.html.haml
+++ b/app/views/layouts/application.html.haml
@@ -20,8 +20,7 @@
     = chartbeat_head_block
     = include_mixpanel
 
-    = include_base_css_framework
-    = stylesheet_link_tag 'application', media:  'all'
+    = include_color_theme
 
     - if rtl?
       = stylesheet_link_tag :rtl, media:  'all'
diff --git a/app/views/layouts/application.mobile.haml b/app/views/layouts/application.mobile.haml
index 390b84367..c0c721c62 100644
--- a/app/views/layouts/application.mobile.haml
+++ b/app/views/layouts/application.mobile.haml
@@ -37,7 +37,7 @@
 
     / Stylesheets
 
-    = stylesheet_link_tag 'mobile/mobile', :format => 'all'
+    = include_color_theme "mobile"
     = yield(:custom_css)
 
 
diff --git a/app/views/users/_edit.haml b/app/views/users/_edit.haml
index 381e46dc7..20d64468a 100644
--- a/app/views/users/_edit.haml
+++ b/app/views/users/_edit.haml
@@ -61,6 +61,14 @@
 
       %hr
 
+      %h3= t(".change_color_theme")
+      = form_for "user", url: user_path, html: {method: :put} do |f|
+        .form-inline.clearfix
+          = f.select :color_theme, available_color_themes, {}, {class: "form-control form-group"}
+          = f.submit t(".change_color_theme"), class: "btn btn-primary pull-right"
+
+      %hr
+
       %h3#stream-preferences
         = t('.stream_preferences')
       = form_for current_user, url: user_path, html: { method: :put } do |f|
diff --git a/config/application.rb b/config/application.rb
index 0c8111377..47d39fcad 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -81,12 +81,12 @@ module Diaspora
       templates.js
       validation.js
 
-      bootstrap-complete.css
       error_pages.css
       admin.css
-      mobile/mobile.css
       rtl.css
       home.css
+      color_themes/*/desktop.css
+      color_themes/*/mobile.css
     }
 
     # Version of your assets, change this if you want to expire all your assets
diff --git a/config/color_themes.yml b/config/color_themes.yml
new file mode 100644
index 000000000..d6365ae02
--- /dev/null
+++ b/config/color_themes.yml
@@ -0,0 +1,5 @@
+available:
+  original: "Original Dark"
+  dark_green: "Dark Green"
+  magenta: "Magenta"
+  egyptian_blue: "Egyptian Blue"
diff --git a/config/defaults.yml b/config/defaults.yml
index ae0877c9f..eed98fde9 100644
--- a/config/defaults.yml
+++ b/config/defaults.yml
@@ -143,6 +143,7 @@ defaults:
         warn_days: 30
         limit_removals_to_per_day: 100
     source_url:
+    default_color_theme: "original"
   services:
     facebook:
       enable: false
diff --git a/config/diaspora.yml.example b/config/diaspora.yml.example
index c894bf4b2..a58a097f2 100644
--- a/config/diaspora.yml.example
+++ b/config/diaspora.yml.example
@@ -533,6 +533,13 @@ configuration: ## Section
     ## If not set your pod will provide a downloadable archive.
     #source_url: 'https://example.org/username/diaspora'
 
+    ## Default color theme
+    ## You can change which color theme is displayed when a user is not signed in
+    ## or has not selected any color theme from the available ones. You simply have
+    ## to enter the name of the theme's folder in "app/assets/stylesheets/color_themes/".
+    ## ("original" for the theme in "app/assets/stylesheets/color_themes/original/", for
+    ## example).
+    #default_color_theme: "original"
   ## Posting from Diaspora to external services (all are disabled by default).
   services: ## Section
 
diff --git a/config/initializers/color_themes.rb b/config/initializers/color_themes.rb
new file mode 100644
index 000000000..9c12af8a6
--- /dev/null
+++ b/config/initializers/color_themes.rb
@@ -0,0 +1,19 @@
+# Generate the path to the .yml file with the available color themes.
+color_themes_file = Rails.root.join("config/color_themes.yml")
+# Check in case config/color_themes.yml does not exist.
+if color_themes_file.exist?
+  # Load the file specified by the generated path.
+  color_themes = YAML.load_file(color_themes_file)
+  # If the file contains one or more color themes, include them in AVAILABLE_COLOR_THEMES,
+  # else include the original theme.
+  AVAILABLE_COLOR_THEMES =
+    if color_themes["available"].length > 0
+      color_themes["available"]
+    else
+      {"original" => "Original Dark"}
+    end
+else
+  AVAILABLE_COLOR_THEMES = {"original" => "Original Dark"}
+end
+# Get all codes from available themes into a separate variable, so that they can be called easier.
+AVAILABLE_COLOR_THEME_CODES = AVAILABLE_COLOR_THEMES.keys
diff --git a/config/locales/diaspora/en.yml b/config/locales/diaspora/en.yml
index 143781b35..1b69bbf35 100644
--- a/config/locales/diaspora/en.yml
+++ b/config/locales/diaspora/en.yml
@@ -1323,6 +1323,7 @@ en:
       current_password_expl: "the one you sign in with..."
       character_minimum_expl: "must be at least six characters"
       change_language: "Change language"
+      change_color_theme: "Change color theme"
       close_account_text: "Close account"
       stream_preferences: "Stream preferences"
       show_community_spotlight: "Show “community spotlight” in stream"
@@ -1401,6 +1402,8 @@ en:
       unconfirmed_email_not_changed: "Email change failed"
       follow_settings_changed: "Follow settings changed"
       follow_settings_not_changed: "Follow settings change failed."
+      color_theme_changed: "Color theme successfully changed."
+      color_theme_not_changed: "An error occurred while changing the color theme."
     public:
       does_not_exist: "User %{username} does not exist!"
     confirm_email:
diff --git a/db/migrate/20150523004437_enable_color_themes.rb b/db/migrate/20150523004437_enable_color_themes.rb
new file mode 100644
index 000000000..d9cea868d
--- /dev/null
+++ b/db/migrate/20150523004437_enable_color_themes.rb
@@ -0,0 +1,9 @@
+class EnableColorThemes < ActiveRecord::Migration
+  def up
+    add_column(:users, :color_theme, :string)
+  end
+
+  def down
+    remove_column(:users, :color_theme)
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 08c88be2f..90367fa20 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -566,6 +566,7 @@ ActiveRecord::Schema.define(version: 20150531005120) do
     t.string   "exported_photos_file",               limit: 255
     t.datetime "exported_photos_at"
     t.boolean  "exporting_photos",                                 default: false
+    t.string   "color_theme",                        limit: 255
   end
 
   add_index "users", ["authentication_token"], name: "index_users_on_authentication_token", unique: true, using: :btree
diff --git a/spec/controllers/users_controller_spec.rb b/spec/controllers/users_controller_spec.rb
index 40006a3af..bde9b7d1d 100644
--- a/spec/controllers/users_controller_spec.rb
+++ b/spec/controllers/users_controller_spec.rb
@@ -152,6 +152,17 @@ describe UsersController, :type => :controller do
       end
     end
 
+    describe "color_theme" do
+      it "allow the user to change his color theme" do
+        old_color_theme = "original"
+        @user.color_theme = old_color_theme
+        @user.save
+        put(:update, id: @user.id, user: {color_theme: "dark_green"})
+        @user.reload
+        expect(@user.color_theme).not_to eq(old_color_theme)
+      end
+    end
+
     describe 'email' do
       it 'disallow the user to change his new (unconfirmed) mail when it is the same as the old' do
         @user.email = "my@newemail.com"
diff --git a/spec/helpers/users_helper_spec.rb b/spec/helpers/users_helper_spec.rb
new file mode 100644
index 000000000..efcdfd081
--- /dev/null
+++ b/spec/helpers/users_helper_spec.rb
@@ -0,0 +1,42 @@
+require "spec_helper"
+
+describe UsersHelper, :type => :helper do
+  include Devise::TestHelpers
+
+  describe "#current_color_theme" do
+    describe "if user is not signed in" do
+      before do
+        def user_signed_in?
+          false
+        end
+      end
+
+      it "returns the default color theme" do
+        expect(current_color_theme).to eq("color_themes/#{AppConfig.settings.default_color_theme}")
+      end
+    end
+
+    describe "if user is signed in" do
+      before do
+        @user = User.new
+        def user_signed_in?
+          true
+        end
+
+        def current_user
+          @user
+        end
+      end
+
+      it "returns the default color theme if user has not selected any theme" do
+        expect(current_color_theme).to eq("color_themes/#{AppConfig.settings.default_color_theme}")
+      end
+
+      it "returns the color theme selected by the user if there is a selected one" do
+        selected_theme = "test_theme"
+        @user.color_theme = selected_theme
+        expect(current_color_theme).to eq("color_themes/#{selected_theme}")
+      end
+    end
+  end
+end
diff --git a/spec/javascripts/support/jasmine.yml b/spec/javascripts/support/jasmine.yml
index c4e49f511..8fca12cf1 100644
--- a/spec/javascripts/support/jasmine.yml
+++ b/spec/javascripts/support/jasmine.yml
@@ -27,9 +27,7 @@ src_files:
 #   - stylesheets/*.css
 #
 stylesheets:
-  - assets/bootstrap.css
-  - assets/default.css
-  - assets/application.css
+  - assets/color_themes/original/desktop.css
 
 # helpers
 #
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 517cacd85..1cc67fe9f 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -364,6 +364,13 @@ describe User, :type => :model do
         expect(user.language).to eq('de')
       end
     end
+
+    describe "of color_theme" do
+      it "requires availability" do
+        alice.color_theme = "some invalid theme"
+        expect(alice).not_to be_valid
+      end
+    end
   end
 
 
@@ -1009,6 +1016,7 @@ describe User, :type => :model do
           unconfirmed_email
           confirm_email_token
           last_seen
+          color_theme
         }.sort)
       end
     end