John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
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!!
FCorp My Desktop - "ALL-IN-ONE" Desktop Related Tools.
DesktopSlides - DesktopSlides is a light and user friendly desktop wallpaper changer for windows.
Wallperizer - Wallperizer is a desktop wallpaper changer.
Random BackGround - Random BackGround desktop wallpaper slideshow with advanced features for Windows