Install Dorian dark theme in Ubuntu 13.04 Raring/Ubuntu 12.10 Quantal/Ubuntu 12.04 Precise/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 13.04/12.10/12.04

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