I'm a big fan of WindowBlids, but it's a resource hog and costs money (2 things I don't like). So when I read about the UXTheme Multipatcher I was stoked! Bacially you can use tons of free Themes that aren't truly supported by Windows.. for free and without sacrificing system resources. My favorite is pictured here (click for fuller size).

*My background isn't usually white, I just did that so you cold see the black portions a little better.*