Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Most desktop wallpaper changers have one thing in common: They can cycle through a list of local wallpapers to display them alternately as background images on the computer system. Only a few wallpaper programs support the Internet and those that do usually support a single source that can be used to download and display desktop wallpapers.
Wally, a cross-platform software for Windows, Linux and Mac is different as it is compatible with many popular Internet image hosting services.
The list of services includes Flickr, Photobucket, Google Picasa, Pikeo, Panoramio, Yahoo, SmugMug and Bing. Wally adds to that the ability to select local folders and files as well.