That's such an awesome cake! I'd totally make something like that for smaller parties where all you need is a little strip of lawn to feed everyone, then get our nerdy on. Wonder if there's a way to make the slingshot functional!
Personally, I'd go with the Jessie J. You could tweak it to be Lady Gaga or Beyonce or whatever. Frankly, a Bedazzler goes a long way with injuries. You should have seen my crutches Freshman year when I got foot surgery. They said six week recovery, I heard six buckets of rhinestones!!