The other morning, I grabbed a couple of handfuls of them and an empty egg carton and gave them to my two year old for a little play time.
First he dumped them out and put them back in, with one pom-pom being assigned to each spot - no doubling up.
Then he began sorting them by colour. He did really well at this. After he had them all into piles, I started asking him questions. "How many purple ones?" "Can you find me a small blue and a big blue?" etc. He is really into colours right now, so he loved this part.
Then he began playing with their sizes. In this picture he is putting a small one on top of a large one and calling it a 'snowman.' So cute.
Then he lined them up by colour AND size. No, I didn't prompt this. I was so impressed. He had finished off the oranges and was just starting the purples in this picture.
Anyway, it was a super easy little activity that took no prep, and he played with them for fifteen or twenty minutes for sure.