My husband remembers Shrinky Dinks from when he was a little boy. I’d never heard of them. One year we bought Shrinky Dinks as a stocking stuffer for one of our kids. It came with strange sheets of translucent paper. You draw and color whatever you want on them. We used colored pencils. Then you cut them out and put them in the oven.
They shrink to one third the original size. You bake the artwork one by one for 1 to 3 minutes each at 325 degrees. (I ruined my first one because I had no clue what I was doing, but the others came out perfect. So you might want to start with one that doesn’t matter if it gets messed up.) If you put your oven light on, you will see it start to shrink. Then count for 30 seconds. Pull it out, and there it is, teeny weeny.
The kids squealed with laughter when they saw their artwork shrink through the oven door. My 10-year-old artist drew a detailed dragon, and the dragon shrank down and looked even more detailed. It was a fun “do-it-once” kind of activity.