Stompers
These are about the simplest toy ever. You could probably build your own (crappy) set with some string and a pair of aluminum cans. But somehow, when I was a kid, I loved stomping around outdoors with these Stompers under my feet. They made me six inches taller, and turned my feet into loud, clompy hooves! They may seem pointless, but they're just the sort of toy that lets a kid have some fun and use his imagination. $8.79 USD.