The guys behind the RAVEfinity project have released an updated Humanity Colors icon theme for Ubuntu 14.04 (and older), which work great with Ambiance and Radiance Colors GTK themes.
The Humanity Colors icon theme pack includes the default Ubuntu icon theme - Humanity -, in 9 different colors: blue, brown, graphite, green, orange (different from the default Humanity orange), pink, purple, red and yellow, all available for both dark and light panels.
The icon theme pack should work with Unity, GNOME (Shell), Xfce, LXDE, Openbox and probably other DEs/shells too.
Here are a few screenshots with the updated Humanity Colors icon pack (and Ambiance Colors) in Ubuntu 14.04:
Install Humanity Colors in Ubuntu
Ubuntu (and Linux Mint / Pinguy OS / etc.) users can install the Humanity Colors icon theme by using the RAVEfinity PPA. Add the PPA and install Humanity Colors by using the following commands:
sudo add-apt-repository ppa:ravefinity-project/ppa sudo apt-get update sudo apt-get install humanity-colors
To change the icon 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. Make sure to use Humanity-dark-COLORX for dark panels and Humanity-light-COLORX for light panels.
For matching GTK themes, see: Ambiance And Radiance Colors Theme Pack Available For Ubuntu 14.04
If you're not using Ubuntu, you can get the Humanity Colors icon theme from here: