I was searching online and I found a Windows 7 Bing theme that sends you two new photos from Bing every week, updated automatically through an RSS feed. It will install a RSS wallpaper feed. I found that it very useful to used this in conjunction with Stardock's Moving wallpaper by point the target folder to the Bing wallpapers. Now i can have Hi-Res beautiful moving walls that will constantly be refreshed with new ones every week.
http://windows.microsoft.com/en-US/windows/downloads/bing-dynamic-theme
