Fairly niche, but just an idea: could DF wallpaper keep the last valid wallpaper? I have my wallpapers on a NAS which I turn off for large parts of the day. I've got random changing wallpapers every 5 minutes, so after the NAS goes off I get a black wallpaper , it'd be nice if when folders were not available DF could just keep the last wallpaper it had used (and which I think is cached).