Ffw-Fast-Forward icon theme is based on hydroxygen(discontinued). Creator of this set worked on each icon, so this icon theme is well designed and look elegant with all kind of light and dark theme. It also offers a new dock style icons, with token icons flavor. If you found any missing icon or want to add any other icon just report to creator via source link. Zukitwo theme used in screenshots, also check other themes collection.
You can use Unity Tweak ToolGnome-tweak-tool or Ubuntu-Tweak to change icons.
ffw icons

ffw icons

ffw icons

ffw icons

To install Ffw-Fast-Forward icons in Ubuntu 15.04/14.10/14.04/12.04/Linux Mint 17.1/17/13 open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:

To install Ffw-Fast-Forward icons in Debian/Any Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
That's it
Source: Ffw-icons
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