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

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.

Gnome Shell Version
ubuntu themes

gray themes

GTK Version
ubuntu themes
Theme tested on Ubuntu 12.04 Precise Pangolin with GTK3+Gnome Shell 3.4.1

1st Install eOS Icons for this theme and also check Icons Collection
You can use these Tools to change theme and icons: Gnome Tweak ToolUbuntu Tweak

To Install GnomishGray Theme on Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
That's it
Source: GnomishGray
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