Malys Uniblue and Uniblack icons are available for all Ubuntu/Linux Mint/other Ubuntu derivatives

Malys Uniblue and Uniblack icon sets propose a different smooth, new and modern icons for Linux distribution. Uniblue/Uniblack are almost complete icon sets and one of both can be fit with any kind of light or dark theme. These icons perfectly works with Gnome, Unity, XFCE, Mate, Cinnamon and other desktop environments (Except KDE). Malys Uniblue icons are designed for dark and light themes, this icon set is kind of transparent in sky blue color. Malys Uniblack can be used with light themes because of its black color.
You can use Unity Tweak Tool, Gnome-tweak-tool or Ubuntu-Tweak to change icons.

1: Malys UniBlue Icons

To install Malys-Uniblue icon set 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:

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

To install Malys-Uniblue icon set in any Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:

Terminal Commands:
wget -O malys-uniblue.deb https://launchpad.net/~noobslab/+archive/ubuntu/icons/+files/malys-uniblue_1.7~trusty~Noobslab.com_all.deb
sudo dpkg -i malys-uniblue.deb
rm malys-uniblue.deb

2: Malys UniBlack Icons

To install Malys-Uniblack icon set 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:

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

To install Malys-Uniblack icon set in any Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:

Terminal Commands:
wget -O malys-uniblack.deb https://launchpad.net/~noobslab/+archive/ubuntu/icons/+files/malys-uniblack_1.7~trusty~NoobsLab.com_all.deb
sudo dpkg -i malys-uniblack.deb
rm malys-uniblack.deb

That's it

Sources: Malys-UniBlack, Malys-UniBlue