Style XP seems to clunky to me, not to mention they still attach 3rd party junk to some of thier themes even if you pay for it. Windowsblinds has gotten much better and uses much less resources than older versions. I use niether.
I went to Belchfire.net
and installed the "multi-patcher". It replaces the uxtheme.dll allowing you to install unsigned visual styles and themes within Windows without having a 3rd party app installed.
The patcher is free though they do have a pay product as well. Use the multi-patcher, it's nice. They have a full tutorial explaining it all and allot of nice themes and styles. You can use themes and styles from anywhere if you don't like the ones on Belchfire so long as you can extract them properly.
Here's the tutorial
for installing visual styles and themes once you have the "multi-patcher" installed.
Here is the silver-blue theme
that I am using. Note the only thing that the author has changed in this style is the luna-silver from green "start" to blue "start" and red buttons to blue buttons. When you install this specific style you will have 2 "Windows XP Style" themes in display properties. One normal and the one you installed. I tried to rename the style but that didn't work. The rest you install will have different names.