I bought several bags of colorful decorative pebbles to use with a behavior plan I was creating for the older kids. But I found that Pufferfish loved playing with them! I gave her the stones in a large empty butter tub, as well as some cups and spoons. Pufferfish spent hours just sitting on the floor playing with the stones, pouring them back and fourth, stirring them, etc. They feel very soothing to the touch and have a fascinating sound when you pour them back and forth! Pufferfish's sister also likes to play with them and will use them to make mosaics on the floor!