For some time, GNOME has been able to use a series of images that change at specified intervals as the desktop background, but the XML files needed are time consuming to write or edit manually, and all users really ought to be able to create background slideshows with the same ease as setting static images as the wallpaper. I set out to make a programmatic solution, and so I present a little PyGTK app I call CreBS, an abbreviation of Create Background Slideshow.