The roll cake dog one is very simple, but nice. Wallpapers don't necessarily have to be full of stuff to look at. If you add too many things they become distracting. Some of them are so full of flashy details they become annoying or nauseating. That's one of the worst thing about most wallpapers I do: I add too many things, I can't see blank spots without feeling uneasy
These ones are clean and cute