Install Elementary Icons in Ubuntu 12.10/Ubuntu 12.04/Ubuntu 13.04/11.10/11.04/10.10/10.04/Linux Mint 14/13/12/11/10/9/Other Ubuntu based Distributions

Elementary icons is made by Danrabbit and has done nice work. Elementary icons can change over 7,500 icons in Linux. It looks really nice with all kind of light and dark themes. There are two versions of Elementary one is "Elementary" it can be use with light themes and second is "Elementary Dark" these are same like first icons but for dark themes to display light icons on panel.

Change log of Elementary Icons v2.5:

• More icons in more sizes
• Merging changes from Humanity
• new mono icons including new monos for dark panels
• Better horizontal spacing for panel icons
• More and Better app icons
• symlink fixes
  

You can use Gnome-tweak-tool or Ubuntu-Tweak to change icons.

To install Elementary 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 elementary-icons