This is the Metro UI wallpaper from the Windows 8 Developer Preview.
Because the original wallpaper in Win8 resizes too much and reconfigures the tiles based on the screen resolution, I made a static wallpaper, where the tiles fit and look better than the original wallpaper image.
There are various resolutions coming with this wallpaper pack:
Widescreen:
2333 x 1200 1920 x 1200 1920 x 1080 1680 x 1050 1440 x 900 1280 x 800
Normal:
1600 x 1200 1280 x 1024 1152 x 864 1024 x 768
You can share the pack, but pease link back to my dA account!