Magic Shrink Plastic
Magic Shrink is a type of plastic that when heated up, it shrinks and becomes a small hard plastic trinket of anything you design.  It comes in packets and kinda reminds me of the transparency sheets we used back in the old days with projectors in school. 
In order to stamp things on the plastic you need an ink that can stick or use this brand of chalk ink pads. 
Step 1
Usually, the plastic sheet is the size of a regular A4 piece of paper, so you have to cut it up and use the size that's suitable.  It says on the package that the finished product will be 1/16 of its original size, so I wouldn't suggest you cut it up too small.  Here, I'm giving it a little color by using the chalk ink pads (ONLY USE CHALK INK PADS) to pad the back of the sheet. 
Step 2
After you get enough color on the back, flip it over and stamp the design you want onto the front.  It's better if you use black when you're stamping on another color. 
Step 3
You don't have to, but you could trim the sides up to hug around your design like I did here.  Make sure to be neat about it or the finished product just ends up looking oddly shaped...
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