this tutorial on Scissors Paper Wok.
I immediately thought this was a perfect idea for making custom buttons to match my mini albums. So I found some Shrinky Dink paper (frosted) at Michaels and decided to give it a whirl!
I punched a circle using a 2" circle punch, and then punched the holes with a standard size hole punch. I traced over parts of a stamp I have, then colored the image in with my Copic markers. (You should use alcohol based markers, or you can use colored pencils as well). I used my heat tool (Martha Stewart's heat gun for embossing powder), and got great results. I did have to try twice, however, because the first time it folded in on itself because I forgot to use something to gently hold it flat. (It's easier in the oven, apparently, to keep the items flat but I would rather be able to make one-off buttons as needed).
Here, you can see the comparison between the cut out and the finished button. It goes from a flat, larger piece of plastic to a small, thick, hard plastic "button." The finished piece is approximately 7/8" in diameter and 1/16" thick.