Well, there are the obvious:
*freezing ice cream (in a homemade-ice-cream-maker)
*keeping in ice chests, lunch boxes, etc, to keep things cold while you get ready to use them.
*putting in plants, to water them slowly for a while rather than drowning them with a hose
*putting down your friend's shirts when they are hot. or when they are cold.
*melting, then filtering, for drinking water
*freezing your credit cards so you won't use them (theoretically)
*chilling wine (in one of those buckets designed to do this...not just in a pitcher you fill with ice then stick the wine bottle in. I mean, that does work, but it's much less efficient and much less easy than the wine bucket.)
*rubbing on your lips after you've played a wind instrument for too long. Popsicles are better, but ice works in a pinch. However, see below on nasty unfiltered water ice. bleah.
*put ice in front of a small fan to cool the air that is blowing through your room.
*put in pet's water bowl in the summer to keep water cool. Pets don't care about filtered water.
*cleaning gum off of fabric. or hair. peanut butter also often works for this.
*cleaning candle wax off just about anything. I haven't tried this on hair but it would probably work. However, if you have candle wax in your hair you need to rethink your habit of standing underneath dripping candles.
*getting paper wet. if you wanted to do this very slowly, you could...just put an ice cube on some paper. soon it will be wet.
*breaking things. ie: computers, printers, toasters, books, windows, etc. you can either throw ice cubes, thus shattering whatever it is you wish to break, or put the ice cube in it and wait for it to melt, thus disabling whatever you are breaking. I don't recommend this necessarily, I'm just saying you could.
*melting. i don't know why you would want to do this--you obviously already have water. and i already said this about 8 lines up.
*holding. i mean, if you were really hot, just holding an ice cube might help cool you down.
*put them in your bath. a cold bath is probably good for your skin somehow. maybe. but this means you can't have a hot bath, because the ice will melt. really this thought is only ideal if you are the person in one of those urban legends...who's had a kidney removed and wakes up in a bathtub full of ice. you know the ones. they aren't true.
*testing the strength of paper towels. how many ice cubes can your paper towel hold? I bet Bounty or Brawny or one of those B-brands can hold a lot. at least their commercials claim they can.
*preserving bugs. your ice maker probably does this for you already. look carefully when you get ice out of it, otherwise you might drink a fruit fly. eew.
ok, i'm tired now and need a nap, but first i have to plan some youth group. which starts in 55 minutes. hmm......maybe no nap. sad.
happy sunday. stay away from ice in your beverages. :-)