well have you used the lantern effect of blue-green guys on the marijuana goddess world?
as for the picture on the top right depicting urotsuki's room. That wallpaper From what I gather is just a placeholder. as for the bottom 3 wallpapers, you have to interact with the number board in the underwater carnival. Try using glasses effect and child effect on the number board. If I recall correctly that should get you the bottom three wallpapers.