Have you unlocked the hidden Windows 7 theme and wallpapers yet?
Well, you better do. They are beautiful:
Instructions to unlock them all:
1. Step Simply open the Explorer (Windows + E) and goto C:\Windows\winsxs
2. Step Enter *.theme into the search field. If you have problems to type *, use the * sign on the number block.
3. Step Now it should look like this: Click me!
4. Step Double-click the themes ZA, US, GB, CA, AU to install them.
5. Step Voilà, you have unlocked 5 cool themes.