Ubuntu Guide posted a quick guide about installing the Mountain Lion Theme in Ubuntu 12.10 Unity, Gnome & Cinnamon

This simple tutorial will show you how to install mountain lion theme gtk 3.6 in Ubuntu 12.10. It will work on Unity, Gnome Shell and Cinnamon Desktop with Nemo or Nautilus.

To get started:

1.) First click following link to download Mountain Lion Theme Package and iLinux icons package:

Mountain Lion Theme by ~haniahmed

iLinux-icons v.2 by ~haniahmed

  Mountain Lion Theme For Ubuntu 12.10 Unity, Gnome & Cinnamon