People who have experience with children know that something as basic as a cardboard box can entertain them for hours; with this in mind, Muzoo by Noa Himelfarb would be a huge hit with kids. It might not involve boxes, but it does focus on the same principle that children don't require the latest big store toy or gadget to expand their imagination and occupy their time. Dirt would do just fine.
That is exactly what Muzoo by Noa Himelfarb uses: dirt. This kit is comprised of simple frames that allow children to pack in mud to form different shapes, namely animal forms such as lions, giraffes or elephants. If parents don't want children getting too dirty, however, they can substitute the mud for something like plasticine.