Shrinky Dinks, as it ways on the wikipedia page, "are a children's toy and activity kit consisting of large flexible sheets which, when heated in an oven, shrink to small hard plates without altering their color or shape. They reached the height of their popularity in the 1980s. Most sets are pre-printed with outline images of popular children's characters or other subjects, which are then colored in before baking."
I remember coloring in and baking Smurf-themed Shrinky Dinks, but to sell the blank sheets for drawing and crafting is pretty genius. The girls were kind enough to spare a sheet for me and so I filled it with boxes of unrelated drawings that you can rearrange into various tiny comics. So here are a few of my Shrinky Dink Comics. (I can't promise that any of these make a lot of sense):