The whole idea of the shell game is that the choices are right there in front of you. It's up to you to make the "right" decision. Image wise I was going for a less is more kinda deal. Hope you guys like it.
I like your idea for the shirt however I am weary on the design. With the shell game you are making a guess, not really a decision, since you have no idea where the ball/marbell is (w/e the case may be). Also, I've never seen 3 shells that looked exactly the same before. So, good try, don't give up on the idea.
About my design