Last year I bought these little snowman kits. It is some kind of clay with plastic pieces so that you can make your own little snowman if there isn't any snow on the ground.
I bought a few of them and kept one unopened on a shelf in the basement. I was happy to break it out yesterday when this one was a little bummed that the snow outside was starting to melt away.
Someday he may not recall the fun of an hour spent making silly snowmen at the dining room table, but I will always have these photos to remind him. Maybe he will surprise me and remember all of these fun, simple childhood activities well into his adult year. I hope that he at least holds on the the creativity and imagination that he has now, the world could use more adults like that.