Install Dorian dark theme in Ubuntu 12.10 Quantal/Ubuntu 12.04 Precise/Ubuntu 13.04 Raring/Linux Mint 14/13

Dorian is dark theme and has many of its own unique characteristics. To name a couple, hovered buttons grow in size, and insensitive buttons/widgets have a diagonal pattern distinguishing them from normal or active states. Dorian's appearance is consistent between Gtk2 and Gtk3. This theme has two metacity themes for left and right buttons.
dorian theme
Theme tested on Ubuntu 12.10 Quantal with Gtk 3.6 and Ubuntu 12.04 Precise with Gtk 3.4

1st: zonColor Wallpapers used in screenshots, Also checkout Black Wallpapers
2nd: zonColor-Icons used in screenshots, Also checkout icons collection
3rd: You can use Gnome-tweak-tool or Ubuntu-Tweak to change icons and themes.

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