Install NouveGnome Icons in Ubuntu/Linux Mint

NouveGnome-Gray icons designed for Gnome and to be use with dark themes. It looks beautiful with every theme, you can give a try.
NouveGnome-Colors looks good with light themes, Author mentioned these icons are not completed yet but you can install them.
You can use Gnome-tweak-tool or Ubuntu-Tweak to change icons. Also Checkout Icons Collection.

1: NouveGnome-Gray Icons

To install NouveGnome-Gray icons in Ubuntu/Linux Mint 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 nouvegnome-gray

2: NouveGnome-Color Icons

To install NouveGnome-Color icons in Ubuntu/Linux Mint 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 nouvegnome-color

You can install these icons on other distributions from here.
That's it

Source: nouveGnomeGray, nouveGnome