At a few weddings I've been to, the couple just ignores the clinking, maybe finally obliges. Guests get the picture and stop. But as far as alternatives, it sounds like there are some great ideas already--I loved those little sound-maker things? What about kazoos, or whistles?
I've seen alot of weddings use a giant dice. Each guest has to roll the dice and do what it says before the B and G will kiss.What the dice says is your choice, but I have seen things like:Dance a jigSing a songKiss the person to your immediate left/righttell a story about the groom/brideso on.