I've seen methods for a TnR effect with an odd backed card. This could be rather useful especially if you want to do TnR with a borrowed deck. Obviously it's got it's limitations on angles, and if it matters, signatures, but it could be cool. Of course you have to have a good way of getting the odd (stranger card, as I've seen it called) into the deck, but once that's done the effect would be rather simple because it wouldn't matter what deck they gave you, the trick would always work.