Install FlatStudio theme on Ubuntu 12.10 Quantal/Ubuntu 12.04 Precise/Ubuntu 11.10 Oneiric/Linux Mint (GTK 3)

FlatStudio theme based on Mediterranean-Night theme. This theme is available in four versions: FlatStudio, FlatStudioLight , FlatStudioGray and FlatStudioDark. These themes are compatible with Gtk 3.6 and Gtk3.4/3.2. Also checkout other themes collection.
FlatStudio-Version
ubuntu themes

FlatStudioDark-Version
ubuntu gtk themes

FlatStudioGray-Version
ubuntu themes

FlatStudioLight-Version
ubuntu themes
Theme tested on Ubuntu 12.10 Quantal with GTK 3.6
Install Nitrux Icons, Also Check Icons Collection
You can use Gnome-tweak-tool or Ubuntu-Tweak to change themes.

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