Wallpaper Shifter is a little program that starts when you login to Windows and picks a random wallpaper from your list. Depending on the wallpaper width and height, it can automatically scale it for you to fit your desktop without deforming it´s proportions. It does not remain running in the background so no system resources are used.

Wallpaper Shifter version 7 is a 'Back to Basics' version. I have removed a lot of features that I'm not looking for in a Wallpaper Randomizer, as version 6 started to turn into 'bloatware'. Two new features were added though, such as "Automagic scaling" and "Background fills". You can also delete the current background from disk.