It works on Linux Mint 19 Cinnamon, with multiple displays. I can set a background image independently for each display.
Works in the newer Linux Mint versions. 17.2 desktop PC . AWESOME.
If the wallpapers change after startup, open "startup applications" and add an entry with the command "nitrogen --restore" (2 dashes and no quotes). Restart to verify.
dont work on linux mint 14
works perfectly, far better than default cinnamon wallpaper changer, especially on multiple displays
do not get how to use it, a bit complicated