G-Xiria icons elegant and well designed icons for Linux, these were made in 2010 and still in active development. It is complete set of icons, probably all icons are available and these icons also work in KDE. If you found any missed icon, just report to developer. Checkout icons collection
You can use Gnome-tweak-tool or Ubuntu-Tweak to change icons.
g-xiria

g-xiria

g-xiria

Install G-Xiria 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:

Install G-Xiria icons in any Debian/Ubuntu/Linux Mint versions open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
That's it
Source: G-Xiria 3.0
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