Install GnomishGray theme on Ubuntu 12.10/12.04/11.10/Mint (New Release)

Install GnomishGray theme on Ubuntu 12.10 Quantal/Ubuntu 12.04 Precise/Ubuntu 11.10 Oneiric/Linux Mint 13/12 (GTK 3 + Gnome Shell 3.6/3.4/3.2)

This is a silver gray GTK3+Shell theme, based on Adwaita, for those who prefer light GTK themes with neutral colors. A GTK2 theme, based on the Murrine and Pixmap engines (provided by gtk2-engines-murrine and gtk2-engines-pixbuf in the Debian-based systems) is also included.
This Theme include GTK 3/2, Gnome Shell Version.

1st: For Ubuntu 12.10 Disable Overlay Scroll bars (See Overlay Scroll bars bug), Enter following command in terminal:

Terminal Command:
gsettings set com.canonical.desktop.interface scrollbar-mode normal

2nd: Install Acyl Icons or Check Icons Collection
You can use these Tools to change theme and icons: Gnome Tweak Tool, Ubuntu Tweak

Gnome Shell Version

GTK Version

Theme tested on Ubuntu 12.10 Quantal with GTK 3.6 + Gnome Shell 3.6

To install GnomishGray on Ubuntu/Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in Terminal:

Terminal Commands:
sudo add-apt-repository ppa:noobslab/themes
sudo apt-get update
sudo apt-get install gnomishgray

That's it

Source: GnomishGray