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For example, this is the kind of plastic often used in salad bar containers.  Look for a “6” on the bottom of the plastic. The plastic needs to be relatively thick to work. Cut away the extra plastic until you are left with a flat square. Put the rack in the lowest oven position.  The reason the plastic works for designs is because it’s made out of polystyrene just as Shrinky Dinks are.  Make a tray out of aluminum foil by folding it until it’s thick enough to hold the plastic. Put the plastic designs on the tray. Bake for about 3.5 minutes. The plastic will curl, and then straighten itself out. Remove, and allow to cool.

Summary:
Obtain a piece of #6 plastic. Preheat your oven to 350 degrees. Finished.