Boredom led me to a thought..

Unfortanetly I do not have a Dragon Cup or I would have used it. I also had another thought. Maybe it could have a compartment somewhere, say if it is a Squirtle Shell, like my cup. The back would have one of those old school Rumble Pack deals like the N64, and sense the tail of the animal would help support the shell. Maybe when you played a game with the 'Shell Rumble' on the Shell in question would vibrate whenever your controller did. With an option to remove the pack in case you have it setting in a precarious spot.