http://www.unsanity.com/haxies/shapeshifter/
This mac os x GUI mod will change the over all look of your mac interface. Here are some screenshots:
http://www.typhoonent.com/picts/1.png
http://www.typhoonent.com/picts/2.png
http://www.typhoonent.com/picts/3.png
http://www.typhoonent.com/picts/4.png
http://www.typhoonent.com/picts/5.png
http://www.typhoonent.com/picts/6.png
http://www.typhoonent.com/picts/7.png
http://www.typhoonent.com/picts/8.png