I ran across some more things with interesting possibilities - more than just a cover, so they're actual "stories" of a sort, but still very short and manageable:
These are ads for Kolynos - a toothpaste with a long-defunct name that nobody knows anymore, so it's easy to suggest that it has effects other than cleaning teeth. With gorgeous art by Frank Robbins, and some ready-made titles for TG fiction, including:
"Guess I'm Not the Marrying Kind!"
"I'm Through With Women!"
"It's Not His Eyes That Need Disguise!"
"Someone Is Reading My Male!"
Really, what more can one ask for?http://allthingsger.blogspot.com/search/label/Koly nos%20Ad