Attention all Firefox users: If you don't have Stylish add-on installed, do it now! (well, you don't have to)
This isn't exactly a "desktop" screenshot, but it showcases the next level of OS customization after WB, webstyles. Stylish is a must-have add-on for all dark theme users. Big-name sites such as FaceBook, Google, YouTube, etc. can all match much more closely to the WB theme you're using rather than viewing them in plain white (translation: BORING! not to mention a strain on the eyes).
WB is Electrosexual, OS is Windows 7 Pro, custom picture used in Tiles, and using Firefox Aero Transparent and Metroid: Other M persona.