I was vinegar bottles to make a raft. But when the project I had planned turned out to need 72 hours to cure, I quickly changed to this one.
It was easy to cobble together from items I had around the house. A plastic bottle, stiff wire, used disposable chopstick, an exacto blade and various sharpies. The kids had a lot of fun making them and the individual style shown through. Some took 15 minutes to complete and some weren't done at the end of the hour long class.