Well, if its going to be MLP related, I would ideally suggest trying to buy these and/or these, but I suspect that you don't have much time left to buy shoes online and deal with waiting for a package or two before summer camp starts. Regardless of that, the only thing I can think of currently is "representing" your favorite pony by wearing an apporiately colored shirt, pants (and maybe a wig/hat) and making some sort of cuite mark out of scratch to slap on your shirt. I realize that the latter isn't anything but creative, but I can't think of anything better at the moment. Unless you want to wear a blond wig, wear a gray colored shirt and pants, and wildly run about, blowing bubbles and screaming "Muffins!" on costume day or whatever it is.