Topography Wallpapers. And, let’s face it, most designers are obsessed with it. Download and use 100+ topography stock photos for free. Topography Wallpapers Wallpaper Cave from wallpapercave.com A wallpaper or background (also known as a desktop wallpaper, desktop background, desktop picture or desktop image on computers) is a digital image (photo, drawing etc.) used as a decorative background of a graphical user interface on the screen of a computer, mobile communications device or other electronic device.