I'm curious to know what is being done in other places. I do the NURU and love it. I have heard of someone doing a "Cold Therapy" massage. Not exactly sure what that is. I think it has something to do with a Ben Gay type lotion. Ouch!!
A client once told me about a "Hot Coffee Bean" massage where you fill the tub w/ hot beans and provider and client do what they will do.
Sploshing is another fun one. Whip Cream, A guy, A Girl and an Air Mattress. Very fun.
Anything else?