During the Los Angeles 2011 Can’t Stop The Serenity the local Browncoats were selling posters and t-shirts based on the artwork by Joey Spiotto, in which he spoofed Doctor Horrible and Firefly (recently I saw one for Buffy). Originally he designed “River Tam and the Fireflies” for Gallery 1988.
It was a pretty successful print for him and it’s being printed again, in sizes up to 4XL, just today and then gone again for a while. Click Here to Buy at Shirt Punch