February 06, 2012, 3:14 PM — Here's how you can add the attractive, light theme Orion to your Ubuntu 11.10 or 12.04 system.
1. Open a terminal window and then type in the following commands, followed by enter after each command:
sudo apt-add-repository ppa:satyajit-happy/themes
sudo apt-get update
sudo apt-get install orion-gtk-theme
The Orion theme is compatible with GTK 3.2 and it also uses the Unico engine.
For more, see the original article at the link below.

Install Orion Theme on Ubuntu 12.04/11.10 for GTK 2-3 | Noobslab














