Ever felt the need to get rid of Google’s boring white background? Well I have run across three really neat styles that somebody has created for Google via the Stylish Firefox extension. To use these, you will have to have Stylish installed.
+ Find Out How You Too Can Make Google Beautiful!

Here is another theme ready for Firefox 2! Planet Mir looks more like the traditional Firefox 1.5 theme, but it has a few new quirks and styles that makes it fit in perfectly with the new Firefox 2 features. If the goal of the theme was to go for a cleaner, crisper [...]

Stylish is to CSS what Greasemonkey is to JavaScript. Stylish allows you to easily manage user styles for the application UI, all websites, or only certain websites. Stylish is better than using userChrome.css/userContent.css because styles are applied immediately instead of requiring a restart.
[Read More About the Stylish Extension!]