Nitrux-OS Icons are available in different versions, it seems really cool in Linux. Icons Author did really good job. You can checkout other icons collection.
"This is the release of my Icon set, which I called Nitrux.
Inspiration from various sources was important, Initially it was going to be an add-on for Meliae, then a port of the Icons of Moblin/Meego, but later I reconsidered the Idea and thus Nitrux as it is now was born."
Screen Shots of Nitrux-OS Icons Versions
To install Nitrux-OS icons in Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal: