I found this at Comic Art Fans. I'm trying to figure out if the owner went around to different artists and have them do a sketch, or if this was all Photoshopped in later. (I'm pretty sure it's the former.) If so, what a great idea! Any of you going to any Cons should try this out.
Click to enlarge. Your mind might be blown. You've been warned!
The artists represented are: Norm Breyfogle, Dan Fraga, Doug Mahnke, Tom Lyle, Roderick Thorton, and Georges Jeanty.