Instead of having each artist in whom gem was interested autograph a piece of his or her work, she had them all autograph a single vinyl toy. I think it was a fantastic idea, and I hope she continues to do this in the future.
You can see it from the front in the picture above. First, it was turned into Jake of Adventure Time by an artist at the Adventure Time booth with drawings on the face, belly button, and fingers (and butt and tail, but that’s shown later). The ears and forehead were customized by Simone Legno of Tokidoki. The Aquabats symbol in the center was drawn by band member Crash McLarson. Amusingly, he had to look at the shirt of the member sitting next to him to remember what it looked like – an ‘A’ with a circle! He must have just wanted to ensure it was perfect. Author John Scalzi autographed the right hand. It looks like bloody knuckles!

This is the autograph of the person who turned it into Jake.

Here’s a close-up shot of Simone Legno’s drawings and autograph. He’s the creator and artist of Tokidoki.

On the side of the head are the autographs of Aquabats members Ricky Fitness and Eagle “Bones” Falconhawk. On the arm is a doodle and autograph by Behemoth’s Dan Paladin. On the back is Aquabats member Crash McLarson’s autograph.

Here’s the back. In the center is a picture of Domo-kun and autograph by Domo-kun’s creator, Tsuneo Gōda. You can also see the tail and butt of Jake.

The back of the ear features a great self-portrait by the M.C. Bat Commander, leader of the Aquabats!

Lastly, here’s a doodle and autograph by Tom Fulp of Behemoth.