A few mentioned using Envelope/Perspective LPE, including me. But I think it was on text, in all cases. (at least the ones I noticed)
I played around with Rotate Copies, but it was going to take me longer to learn how to use it effectively, than the contest deadline. I really wanted to do a Kaleidoscope, type of design. I wonder if that should be a consideration next time, to give a longer amount of time for the contest, for users to learn the new features?