Ravefinity icons are hand picked and refined dark colors brought to you by ravefinity, it is a mixture of different icon sets are: Faenza, Humanity, Elementary and other icon themes. This icon suite offers 12 color variants and each color is available for light and dark panel, so you can use any color with any theme (doesn't matter it's dark or light). Ravefinity guys also provided suite of Ambiance & Radiance themes in different colors you can check here. If you found any missing icon or want to add a new icon then report here.
You can use Unity Tweak ToolGnome-tweak-tool or Ubuntu-Tweak to change icons.
Screenshots

>>> Available for Ubuntu 14.04 Trusty/14.10/13.10 Saucy/Ubuntu 12.04 Precise/Linux Mint 17/16/13
To install Ravefinity-X icons in Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
That's it
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