You can make blocks out of empty, rinsed-out paper milk cartons. Open the top, and fold down the sides to make a cube. Tape each block shut. Baby may enjoy larger toys, too. A cardboard box with the ends cut out can be a tunnel.
Baby can also roll over a pillow or beach ball and crawl into a paper grocery bag.
Children love to do things their parents do. By 12 months, about one out of four babies will imitate housework. Or give the child a broom, toy hammer, dusting cloth or other object to do work just like you do. Sometimes I feel guilty. Of course not.