A long time ago I used to use StyleXP to give my desktop new themes. It was cool, but buggy. I started searching to find if Microsoft released more themes, and they did, but they were advertisements for something like Spiderman and changed all the icons. I just wanted some new colors. Well microsoft released a dark theme based off of the zune. They also made one for Windows XP Media center edition and released it, but finding it online took some time, as it is not on their website anymore. So here are the two themes.
ZuneDesktopTheme.msi (1.64 mb)
RoyaleThemeForXP.exe (871.77 kb)