Last year Joey made cast handprints for the grandparents. Take homemade claydough, cut a circle large enough for his hand to fit into (I used a pot lid), and have him press his hand into it. Bake it to harden. Once cooled, paint his hand with finger paints, and set his hand into the indentation. Once dried, I sprayed it with a clear matte sealer. This could be done with feet, too.
We also made a variety of shapes when doing this (thank you, Amazon, for having the 101 pice cookie cutter set!!), and we painted all of them with the finger paints. Some were turned into refrigerator magnets (because I forgot to put holes in them

) and some into hanging ornaments. They were a hit at Christmas!