I found this awesome theme on digg.com, I have installed it on my machine and it works great. The advantage of this theme pack is that it does not require a third-party program, it modifies adds to the existing set of themes on your machine. The theme is absolutely gorgeous, you don't sacrifice any resources because it's just like having another built-inWindows XP theme selected. If you chose to install the Y'z Shadow, and the other adds those do take up resources, but no more than 25 MB of RAM.
Download it - http://en.crystalxp.net/bricopack.php
Only little problem I've experienced, sometimes the icons on the bar get stuck, all you have to do is hover above the icon and it'll go away.
Icons added to taskbar