MyElementary icons for Ubuntu/Linux Mint/other Ubuntu derivatives

Elementary icons are elegant and created by Magog64. Elementary icons offers more than 13,000 icons for Linux. This icon set can fit with any kind of light and dark theme but according to creator these icons are specially optimized for Elementaryish dark-panel theme. Also check icons collection
You can use Unity Tweak Tool, Gnome-tweak-tool or Ubuntu-Tweak to change icons.

To install MyElementary icons in Ubuntu 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:

Terminal Commands:
sudo add-apt-repository ppa:noobslab/icons
sudo apt-get update
sudo apt-get install myelementary

That's it

Source: My-Elementary