This simple and brief tutorial is going to show you how to install the beautiful icon theme Moka in Ubuntu 13.10, Ubuntu 13.04, Ubuntu 12.10, Ubuntu 12.04.
This icon set is still in developement. So the good choice is to install the theme from PPA and receive updates.
Press Ctrl+Alt+T on your keyboard to open terminal. When it opens, run below commands one by one:
sudo add-apt-repository ppa:snwh/moka-icon-theme-daily
sudo apt-get update
sudo apt-get install moka-icon-theme moka-icon-theme-dark moka-icon-theme-blue
Once installed, use Gnome Tweak Tool or Unity Tweak Tool to choose the icons you want to use: