This theme is based on the menus and UI from the id Software game Doom 3.
No resources were taken right from the game, just based on screenshots.

To install, you must have the Murrine GTK2 engine, available in most distros by default, or in the repositories.
Then drag the archive to the Appearance Preferences, or extract it to ~/.themes

The glow in the screenshot (on the window borders and menu) is from the Emerald theme (Neon Shadows: http://gnome-look.org/content/show.php/Neon+Shadows?content=139864), it's not included with this download.

Also, I couldn't have a very big (file-size) preview because of the limit here, but there is a much better preview on deviantArt, linked below.

Have fun!