Moka is a stylized Tango-esque Linux desktop icon set. They are designed to be a clear, simple and consistent. Despite being a modern theme, Moka does not use vector icons. Instead each icon has been pixel-perfectly-designed in seven sizes for the best result throughout your desktop.
Install Moka icons:
Moka icons can be easily installed by running below commands one by one in terminal (Ctrl+Alt+T) from PPA. Currently supports Ubuntu 14.04, Ubuntu 13.10, Ubuntu 13.04, Ubuntu 12.10, Ubuntu 12.04, Linux Mint and their derivatives.
sudo add-apt-repository ppa:moka/moka-icon-theme sudo apt-get update sudo apt-get install moka-icon-theme
Once installed, apply the icons set via Unity Tweak Tool or Gnome Tweak Tool.