A tray of baking soda + colored vinegar = chemistry fun!
Quick & Easy Baggie Maze (Great boredom buster!) from PowerfulMothering.com
Colored Vinegar & Baking Soda Experiment for Kids -- the kids will love this one!
clean an iron using vinegar & baking soda
Make lava using a tub of baking soda and colored vinegar dropped from a medicine dispenser or eye dropper.
Stuff for the home
Quick boredom buster with no set up - writing on the window!