First off, thanks for all the great photos!
Next up... Although they've been strangely silent in this thread, there are many pie fans here who strongly prefer real pies to shaving cream pies. I'm just one of them. (Please, real pie fans, chime in here. A girl could really get the wrong impression from the UMD response so far on this thread!)
I'm not trying to stop you from pursuing more shaving cream adventures, I'm just here to say that the stuff you prefer -- actual edible pies -- is favored by at least as big a group of folks here as those who prefer shaving cream. So if you pursue this wam thing, maybe you could consider alternating between the two options. (No, you can't please all the people all the time, as always. But you can appeal to both pie camps over the long haul!)
I'm especially fond of pies that are real crusts filled with pudding or pie filling and topped with an enormous mound of cool whip.