The problems with desktop wallpapers is that they soon get boring. The unusually-named Wally attempts to make sure that you don't get bored too quickly by downloading and rotating wallpapers from different sites.
Wally is a Qt4 wallpaper changer using multiple sources like files, folders, FTP remote folders, Flickr, Yahoo!, Panoramio, Pikeo, Ipernity, Photobucket, Buzznet, Picasa, Smugmug, and Bing images. That's the theory anyway, but the reality I found is that Wally neither downloads or installs dekstop background like it should do. When you setup Wally, it places an icon in your Menu Bar. Click on this to reveal a drop-down menu and access the 'Settings' option.
The main interface is fine. Along the left side, you get a huge number of sites to choose photos from including Picasa, Bing and Flickr. However, for some reason Wally would not download any photos or images from any of the sites. The theory is that it downloads images based on search tags, install them and then rotates them to keep your desktop fresh. The only way I could load an image into Wally was to upload those stored on my hard drive.
Wally is a nice idea and the interface is fine but the functionality was very poor when I tried it.