in addition to changing up form leg kicks like you said a superman punch. my friend i spar with told me to sweep people by hooking their foot with my foot and then pulling it out from under them. and if you punch them, the strike or them avoiding it makes them fall over. interesting stuff. i've tried it but it's hard to do fast and i really don't especially like it, but it's fun to try sometimes.
I know this is exactly what you're talking about. The stuff you don't hear about doesn't work often. that's why you don't hear about it. but its still fun sometimes.
I'll have to try that suprman punch. i can imagine axactly what you mean. Sometimes i spar a tkd guy and he does this jumping back fist thing. it's tricky and it almost always gets me, but it doesn't hurt that much and it usually promts a clinch which isn't good for him. so i imagine a jumping high hook might be interesting. cool.
there's this site stickgrappler.tripod.com i think, and he has a section about muay thai combos and he says to clinch with poeple by grabbing their guard by their elbos, and then give a knee and if the try to block it throw an elbo, and then take the neck clinch. he says it's extreemly effective and keeps you from catching an elbow on the way in. i can't make it work though. i must be doing it wrong.