Once my common sense kicked in (After balloon number one) these were pretty easy! We had to do them in the bathroom because the filter on our kitchen sink doesn't allow for putting the balloon on it!
I'm sure water balloons could be used too but these are regular balloons...that being said I wasn't sure exactly how much water they would hold before they fell off the faucet so these are pretty small!
Simply fill the balloons to desired size, remove from faucet and tie....I shook them up a bit to make sure the food coloring wasn't all in one place.
So like I said...I wasn't thinking for the first balloon [notice the yellow all over my fingers and the balloon] and I filled it with water and THEN I tried to put the food coloring in it...DUH!!!
The next three balloons I put stretched them out a bit and then put the food coloring in BEFORE I put them on the faucet! <--- This worked much better :)
Then, place the balloons outside and let them freeze... (Bug noticed we didn't have a red one...so we add a balloon)
Take your scissors out and cut off the balloon leaving the 'ice marbles'
Original Idea from : HERE