I found a couple of new, better XP themes.

[slimdog360]

This is for those of us who must use windows from time to time and think, "why is this thing so ugly, I wish I could make it look better without the spyware,,bloatware crap of windows blinds". Well here is your answer, a black theme and a new blue theme, both from softpedia so its a credible source. And no, you dont need to validate your copy of windows by installing any wga stuff.

blue
http://www.softpedia.com/get/Desktop-Enhancements/Themes/Royale-Theme-for-WinXP.shtml


edit: After just installing the black theme, Ive realised that its not black at all but rather a crappy theme. So I'll still give the link for those who want it but just note that it doesnt look as advertised. But the blue is still quite nice.
black
http://www.softpedia.com/get/Desktop-Enhancements/Themes/Royale-Noir-Theme.shtml

[derjames]

There are more Windows XP themes at

http://www.crystalxp.net/bricopack/en.htm

The MacOS X style is nice!... more themes from the same website at

http://www.crystalxp.net/galerie/en.cat.3.htm

and in particular the black 'zune' theme I think is nicer than the default blue...

[manmower]

You don't need Windowblinds to change the look of Windows. Just install the uxtheme.dll hack and use a visual style (many are available on deviantart and Neowin) instead of a WB theme.