A recent video on this site which shows how to use peanut butter to fix scratches on a DVD got me thinking about other foods we use in nonfood ways:
People on TV sitcoms and in cartoons always use raw steak to put on a black eye. Personally, I've never seen anyone do this in real life but I'm sure it's been done.
Kids use pasta/macaroni for art projects in grammar school.
Mr. Potato head and all of his relatives and friends (the original sets also suggested using onions, peppers, oranges, etc.)
Oatmeal is used to exfoliate the skin.
Butter and Crisco are used as sexual lubricants.
What can you add to the list?