Just a simple script wich apply a random wallpaper to your desktop.
You can run this script under CLI or GUI, so you can make a cron job with this script to randomize your wallpaper o

Note : The script needs zenity to runder on a GUI.

Just type ./random_wallpaper.sh --help to see the available options (don't forget to type chmod +x ./random_wallpaper.sh before your first run !)

This script is under GPL so feel free to share or modify it !