Remember shrinky dinks? Those were fun but man did they smell when they cooked. There was also those stained glass forms and you'd pour the crystals in and bake them. They were pretty cool too.
My kids LOVED shrinky dinks. I am pretty sure they are still out there. I know you can get the crystal things at the craft stores.
I want to find those wooden paint by number ornaments--they would come in a box of several with the paints. We used to paint these at my Grandma's all the time.