Blue-Remix icons are derived from Rhor, Ubudao-Style and Elementary Sky-Blue icon sets. These icons are well designed and complete icons for Ubuntu/other Ubuntu based distributions. Author also mentioned about these icons also give taste of windows icons.
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blue remix icons
blue icons
ubuntu blue remix

You can use Unity Tweak ToolGnome-tweak-tool or Ubuntu-Tweak to change icons.

To install Blue-Remix 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 Blue-Remix icons in any Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
That's it
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