A friend did this activity for one of our art groups – frozen chunks of colored water with plastic animals suspended inside. Once frozen, they can be dumped into a bin with smaller ice cubes. Children can then use spray bottles full of warm water to melt the ice and try to free the animals inside. I did this for another event and was amazed at how well it occupied all the children, from ages 2 – 8, while their parents visited. I used recycled containers to make the blocks.