Sticks. I was a big fan of sticks. Sticks can be laser swords, they can stir up puddles, they can be pretend fishing poles, they make a cool noise when you whip them through the air.
My parents were nice enough to buy me all kinds of toys, but I liked the sticks. I imagine this is like whatever it is that induces cats to ignore their own toys and go play with the boxes. (Actually, I liked boxes too, the bigger the better.)