Ambiance & Radiance colors is a theme pack that provides Ambiance and Radiance themes in 9 different colors: blue, brown, graphite, green, orange (different than the one used by default in Ubuntu), pink, purple, red and yellow. The pack supports Unity/GNOME as well as Xfce and LXDE/OpenBox.
The themes were updated recently with support for the latest Ubuntu 14.04 LTS.
GTK Theme Preferences (gtk-theme-config) can be used to recolor GTK themes to any color you want however, it doesn't work with Ambiance and Radiance from Ubuntu 14.04 because they use PNGs for checkboxes, progress bars, etc., which can't be changed by this tool.
In my test, the themes worked as expected under Unity, but there's a small glitch under Xfce: the panel text, used by the clock or some indicators, uses a dark color on a dark background, making it unreadable:
|Ambiance Colors under Unity|
|Ambiance Colors under Xfce|
Install Ambiance & Radiance colors in Ubuntu 14.04
Ambiance and Radiance Colors can be installed in Ubuntu 14.04 by using the RAVEfinity PPA. Add the PPA and install the themes using the following commands:
For other Linux distributions or if you don't want to add the PPA, you can get the themes from HERE.
sudo add-apt-repository ppa:ravefinity-project/ppa sudo apt-get update sudo apt-get install ambiance-colors radiance-colors
To change the theme in Unity, you can use a tool such as Ubuntu Tweak or Unity Tweak Tool. For GNOME Shell, you can change the theme using GNOME Tweak Tool.
Thanks to Jared for the tip!