I found this thing that's called Vistamizer, it transforms your Window$ XP in Vista look. During the installation you can even choose to install some add-ons, like glass2K that makes the windows transparent and the best one that is Winflip: there is a button in Vista that when pressed let you see the opened windows in 3d, and you can choose the one you need, this liitle thing make the same but in a better way: when you draw a circle on the desktop it goes 3d ... All these things are useless, will eat useful memory and your system will become a little slower (but I'm having a lot of fun )
Obviously all are freewares :
Vistamizer
http://vistamizer.softonic.de/
it's all in german, but, hey, we have Andreas here , and however you can choose the language during the installation
Winflip is here:
http://winflip.stylekings.de/
have fun