I spotted a beautiful Microsoft Windows 7 wallpaper on devianART web site. This is an unofficial wallpaper created by Frnak and it is available to download for free. The download zip file contains different resolution images. So you can can pick the right right wallpaper that suits your computer screen.
For those who don’t know about Windows 7, it is the next version of Microsoft Operating System scheduled to release in couple of years time to replace Windows Vista.