A cardboard playhouse that you can easily build and folds back up flat for easy storage is kind of every parent's dream come true. Toddlers and little kids will be entertained for hours (and hopefully, days and weeks), thanks to the various characters and accessories that each kit comes with. If they want, they can even decorate the castle with markers of their own. If castles aren't your kid's thing, there's also a rocket, teepee, windmill farmhouse and palace kit.
To buy: The Grommet, $100