Original post with updates :
http://forum.suprbay.org/showthread.php?tid=64016

v2.0
I tried to keep the code clean, there's a lot of comments (/* */) so it should be easy to tweak it by yourself if there something you don't like.

This CSS is made for Opera, but should be fully working with Firefox + Stylish.
Feel free to modify it to fit your browser.

Full CSS for Opera :
http://www.mediafire.com/?n5nyswanr4dlgoa
Full CSS for Firefox :
http://www.mediafire.com/?7ztnez850x78el0

Screen-shots :
http://img268.imageshack.us/img268/1585/93015435.png
http://img529.imageshack.us/img529/6329/40112063.png
http://img822.imageshack.us/img822/803/51809080.png

The SuprBay - Dark Clean Mesh :
The SuprBay - Dark Clean Mesh v2.0

The Pirate Bay - Dark Clean Mesh :
The Pirate Bay - Dark Clean Mesh v2.0