These cardboard blocks get so much use in my home. All three kids love them and play with them in different ways. Here is a picture of Frannie and Adam playing like they are horses inside of a stable.
They are constantly coming up with different imaginative games with these blocks either as a scene, or just as something fun to stack up high and knock down or walk across like a bridge. They are both lightweight and sturdy. The kids are 6, 3, and 1 and it's been a favorite with all of them.