My DD is a big fan of her stacking cups, simple puzzles, shape sorters, riding/pushing toys, and books. In the "non-toy" category, she loves to play with the tupperware, pots, and pans. My lower kitchen cabinets (except for one which is locked where I keep cleaning supplies) are all "Katie-safe" and she just takes stuff out of there and plays with it all the time. Sure I have to wash it a bit more often, but she loves to check out what's in there and explore so I don't mind.