We were sitting outside one night and decided to make a spider web to hang the hangers on. I knew I had some random length pieces of string from some completed knitting projects. He thought it was so neat that we sat there counting, hanging and re hanging them the rest of the night. Ahh, simple pleasures.
On a similar note, I found this weaving project that I think would be completely fun to do when he's a little older. We'd just need to find a hula hoop to use, which we currently don't have.