No. 4: Redshift V2

Take a slide into the darker side with Redshift V2, a black-and-red Firefox theme that could appeal to both goths and 2 Fast 2 Furious racing types. A side bonus: The red highlights throughout the interface may convince coworkers that you bite.

The unique look wasn't enough to keep me around long, however. As pictured, I made much use of the Theme Switcher feature enabled by the MR Tech Local Install extension during my trip into the world of themes. Off to Japan!