OSX_Nostalgie icons are based on Ubuntu Style icons, If you like Mac OS X, but you prefer Ubuntu, then this set of icons OSX-Nostalgie for you. This theme is a compromise between the style of Mac OS X and the style of Ubuntu. Checkout icons collection
You can use Gnome-tweak-tool or Ubuntu-Tweak to change icons.
osx nostalgie icons

osx nostalgie icons

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