Have you unlocked the hidden Windows 7 theme and wallpapers yet?
Well, you better do. They are beautiful:

Download Windows 7 Theme Germany + 6 Wallpaper

Instructions to unlock them all:

1. Simply open the Explorer (Windows + E) and goto C:\Windows\winsxs

2. Enter *.theme into the search field. If you have problems to type *, use the * sign on the number block.

3. Now it should look like this: Click me!

4. Double-click the themes ZA, US, GB, CA, AU to install them.

5. Voilà, you have unlocked 5 cool themes.

You might like these sexy wallpaper, tweaks and themes:
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  Emma Watson
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  Secret Tweaks
• 
  Mac OS X Lion