Here is a quick and cheap toy you can make your kids. When I mean cheap, I actually mean free. All you need is a shoebox lid, straws, glue gun and a couple of marbles.
Cut up the straws to create a maze. Glue the straws to the lid with the glue gun:
Add some marbles and play. I made this about an hour ago and my son is still entertained by it. I give it an A+++++!