Windows 7 comes with a bunch of hidden wallpapers which can be activated by the distributors of the computers on which Windows 7 will be installed. In current versions of the pre-releases, you'll need to perform a little registry hack to unlock the themes, or simply get the ones you like from here.

The extra backgrounds come in themes from 5 countries. It's likely we'll see more countries featured in later versions. (Like where the hell is any Asian country?)

Click on a thumbnail to get the full sized version.

Australia Set:

Canada Set:

United Kingdom Set:

America Set:

South Africa Set:

Don't miss out on the special edition win-shark wallpaper and the
standard set of Windows 7 wallpapers.

If you are already running Windows 7, you can find these wallpapers in C:\Windows\Globalization\MCT.

Check out Apple's Snow Leopard Wallpapers too!