I went for a walk and found some acorns. They were fat and short. They look like sawtooth oak acorns. (I saw the word "sawtooth oak" for the first time. Actually the leaves are in sawtooth shape!) I put a wooden toothpick on each of them to make spinning tops. It is very simple toy, but my sons tried again and again. Additionally, I wrote faces on them. They are cute, aren't they?