Becrux Wally - Wally is a Qt4 wallpaper changer, using multiple sources like files, folders, FTP remote folders, Flickr, Panoramio, Ipernity, Photobucket, Buzznet, Picasa, Smugmug, Google, Vladstudio and deviantART images. Now it's available in many languages!!
AutoWallpaper - Using AutoWallpaper:
Artpip - Artistic wallpaper for your desktop, refreshed daily.
Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.
Kuvva - Kuvva is the source for beautiful wallpapers.
Wallpaper Wizard - Wow-worthy backgrounds for Mac