Wally is a Qt4 wallpaper / background changer, using multiple sources like files, folders, FTP remote folders, Flickr, Yahoo!, Panoramio, Pikeo, Ipernity, Photobucket, Buzznet, Picasa, Smugmug and Bing images. It runs under Linux, Win32, and MacOSX.

Homepage: www.becrux.com/index.php or sourceforge.net/projects/wally