Sometimes kids need toys that will develop them and their motor skills. You will need just flexible plastic straws. Take 2 straws. Squeeze the short end of one straw flat and push it inside the long end of the second straw. Then push the same short end of the second straw inside the long end of the first. You can easily make triangles with 3 straws. You can make simple 2D structures, just put some bows over a triangle. Let the kids try out different angles. You can easily make a mobile with 3 triangles. For simple 3D structures, make a pyramid with 2 triangles and one bow. The rest of the tutorial is here.