To prepare this activity, I filled a plastic container with small toys, marbles, and gems and then filled it with water. I put the container in the freezer and forgot about it for at least a month (that always happens!).
I finally remembered the container was there (when I was searching the freezer for something to cook), so I dumped the ice block on a pan and gave it to the girls along with salt, water droppers, a hammer, spoons, dull children's knives, and a cup of water.
We all worked together to get the toys out of the ice, and it was tons of fun...as usual!