John’s Background Switcher is a freeware tool which periodically changes the background image on your computer. Specify which pictures to choose from.

Did you know you can use videos as background in PowerPoint? We explain how to make animated moving background in PowerPoint slide.

While test-driving the new Gnome 2.28 desktop, I was surprised to see that among the default backgrounds, there was a "Cosmos" slide-show of several cosmic pictures of space that regularly transition ...