This was the easiest craft ever! I purchased a pack of 6 Kroger brand sponges for $1. Cut them into stripes. Tied some together with yarn. And handed them to Clare to see how she would play with the spongeballs. She sprayed them with her water bottle! Not a big surprise. And then she said "play catch." She has been playing with these for over a week. I'm guessing because water is involved.