Couldn't find the other thread, but here's some funny stuff. http://mightygodking.com/2009/02/23/and-the-circle-is-complete/
Different take on the "fake book covers" theme, by taking an existing cover and replacing the title. Some are funny, but some fall flat to me. Although my favorites are "The Fabulous Romulan War" and "Worf vs the Pretty Flowers"!
I don't have the artistic chops to pull off something like this but now I can't look at a Trek book cover without thinking about a funny title. Remember "Worlds of Deep Space Nine" series. They look like Christmas ornaments so...............