A theme with a Firefox background. I decided to make this because FF seems to fit with the Linux community's values.
This version works best with monitors of ratio 16:10. It should also work with 16:9 monitors, albeit with a little distortion.
The screenshot is from the 4:3 version.
Theme based on hairypalms19's Green Glass theme: http://gnome-look.org/content/show.php/Green+Glass+GDM?content=57855
Background image from http://thebestwallpapers.net/wp-content/uploads/2012/08/631.jpg