>>42506182
For what it's worth, I would bet 5 bits that any common desktop operating system/desktop environment can do a slideshow on wallpaper without third party software. Well, I seriously doubt if current GNOME has that option. Maybe if hacked together via day/night variants.
The moon pony surely had some pretty landscapes painted for her. Pic rel crops well to 3:2 and to 21:9, which again from practical standpoint means the same cute pony on both undocked laptop, and on external display once docked. Maybe better for a lock screen, but it doesn't stand out too much as desktop either.