Although Microsoft has not released Windows8 yet, but some users have created great Windows8 wallpapers which you can download for free.
Here is a collection of free and awesome Windows8 wallpapers for your desktop. You can download all the wallpapers using this link or right click a wallpaper for the full sized version.
Minimalist Windows 8 wallpaper
Windows8 ultimate wallpaper with Light effect
Windows 8 wallpaper with Glow effect
Simple Windows 8 wallpaper
Attractive and Bold Windows 8 wallpaper
Gradient Windows 8 wallpaper