Never buy that Shrinky Dink crap, you can make your own, for free!
Step 1: What to have
You will need:
Type 6 Plasic
Step 2: Cut the Plastic
Cut out the shape that you want for your plastic. If you want to, add a smiley face, some hair, whatever.
Step 3: Preheat the Oven
Preheat your oven to 350 degrees Fahrenheit.
Step 4: Prepare the rest of the materials
While the oven is preheating, cover the front of your cookie sheet with aluminum foil, shiney side up! Place your plastic creation on it and get ready for the next step.
Step 5: Place the sheet in the oven.
When the oven is finished preheating, place the cookie sheet in. Watch your plastic as it curls and "crumples" up. After the plastic has curled and flattened back out, take it out. The plastic will have shrunken!