Did you know that more than 10,000 images were evaluated during the Vista wallpapers selection process ? Some of them was from amateur photographers recruited from Flickr, and even Microsoft employees who enjoy photography! You can read more on these wallpapers here and here.
Photographer Hamad Darwish provide on his website a photo collection of images taken during Microsoft's Windows Vista photoshoot and did not make the cut into Vista's Wallpaper Collection.
See the full set on his Flickr gallery :
You can download his High Resolution Windows Vista Desktop Wallpaper Pack:
Finally you can download the Windows Vista Wallpaper Pack on deviantART :