This was my oldest daughter's idea and she made it herself. She is very independent and motivated when it comes to getting projects done.
She simply opened a can of rice. We keep a lot around because she can't have wheat and we follow the practice of Food Storage.
She covered a Costco box from a recent shopping trip, with duct tape. Imagine that, huh? :)
The texture of the grain between your fingers is relaxing, and she has really enjoyed it. This would be a great FREE craft to make for toddlers to use as long as they were well supervised :).