If you're a Firefox 3 user then there's an easy way you can color up your browser with a simple addon:

Colorful Tabs

Installed in just seconds, this is a very fast and neat way to improve your browser's appearance and get rid of the dull colors of the stock Firefox. While it doesn't enhance the browser's functionality in any way I still think it looks very cool, a must-have for every Rainbow Brite Fan!

No I don't get paid for advertising this! LOL .. I simply like it and wanted to share

"SunSpire"

Cute add-on. I don't always use Firefox though.

That's pretty neat, Sunny. I've never seen that sort of add-on before. I may consider adding it. It would brighten up the dull grey. I already attempted to brighten it some by making my windows colors purple instead of the usual blue. It also tinted the default taskbar in Vista as well...so more color could be good.