This is a great lesson in Opportunity Cost with Playdough. Perfect for that classroom that has food allergies! The students are given a budget of $2.00 and must use the that budget. They are encouraged to save money and be creative. They are to create an animal using only the playdough balls they purchase (you must make the playdough into 2 inch balls ahead of time.
As an extension, you can give the leftover playdough to a group of 4 and they must create a breakfast, lunch or dinner creation. The most creative group wins a prize.