This theme has a fractal background image that looks like a big spider!
Adium gives you plenty of ways to customize the way it looks and acts view it
Completely change the way Windows looks, feels, and acts view it
Set up your preferences and even change the way Wikipedia looks! view it
A look at Microsoft's latest, the Windows 7 beta view it
Windows Live Messenger allows you to customize a variety of options view it
Here's how to change the boot order on your PC view it