Did you just ask about uses for dry ice?!?
[b]WooooHooo, boy! Let me tell you what WE do with dry ice![/b]
Take an empty plastic 2 liter Coke bottle, and stuff a few chunks of dry ice through the neck.
Make sure you cover the bottom of the bottle fairly well.
Take the bottle out into the yard, with a cup of water.
Have the cap handy.
Pour about 4-6 ounces of water into the bottle, and replace the cap tightly.
Stand back and hold your ears!
Depending on how fine the dry ice is in the bottle, and how much water you use, the time till the blast will vary! I have never seen them detonate sooner than 10 seconds, One time we had one fail to detonate because we didn't use quite enough ice. We shot that one with a BB gun.
(Don't use dry ice dust, or tiny chips, as they will boil too quickly. Use larger pieces, about the size of a dice. You don't need that much water, but you do need enough to prevent the mixture from completely freezing. A little dry ice goes a LOOONG way. 20oz, 12oz bottles, and 1 liter bottles also work)
Be careful and have fun!