Bet Your Kids Like the Cardboard
When I was a kid, the best present we had was when my mother gave us kids boxes from the TV and the refrigerator. We hid in them; drummed on them to make music; made houses and tunnels when we got enough of them.
Retrieve a box from work and give it to your kid and if you have time perhaps you can create some toys with the kids.
Living in a Box

See
http://www.monkeyc.org/dome/
Thomas and Percy the Tanks

Guaranteed - months of fun. And after they have been damaged due to train crashes, the kids can learn to fix their toys!
For more box ideas, check out these great links:
www.mrmcgroovys.com
http://www.artistshelpingchildren.org/boxescardboardboxesartscraftstideasprojectskids.html
Date: May 2007