...and you want to personalize it a bit check out the following...
http://www.tgtsoft.com/
While there are others that do the same Style XP is simply easier, straighforward, and generally trouble free. The community for it is active and there are always new themes and color variations.
Now if you're more tech savvy check out...
http://www.stardock.com/products/desktopx/
It allows more intensive customization and GUI modification. The community is also quite active and dedicated to the program.
Both are pretty cheap depending on what you want to use them for. Either way they allow one to inject more personality into their machine beyond the standard windows themes.
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