Frank Zappa recruited artist Neon Park to create a subversive image based on a cover story from the September 1956 issue of Man's Life, a men's adventure magazine. After showing Neon a copy of the magazine, Zappa inquired, "This is it. What can you do that's worse than this?" Neon's answer was to craft a parody of an advertisement for Schick brand electric razor based on the "Weasels Ripped My Flesh" theme.
German releases of the album featured an album cover showing a metal baby caught in a rat trap. This cover was not approved by Zappa.
I guess you can do a lot worse than that.