Leftover salad

Got just a few leftover, cut up vegetables? Put them in your blender, add some liquid if needed (tomato sauce, grapefruit juice, etc., whatever is appropriate) and make a cold soup or vegetable drink.

Or cook them (even lettuce!) and puree for soup stock. If you don't want to use it at that moment, you can freeze it for for later.

Popcorn to cornmeal

Got popcorn that won't pop? Mill it into cornmeal and make yourself some delicious corn bread! If you don't have a flour mill, put the corn in a cloth bag or wrap it loosely in cloth, then crack it by hitting it with the flat side of a hammer or something similar. Finish milling it in your blender or food processor. Sift out the larger pieces process again.

Powdered sugar

Make your own powdered sugar: Process a cup of granulated sugar and a generous tablespoon of cornstarch in your blender until it's powder. That's one less product to buy and store.

Hey, I could'a had a V-8!

Or a V-2, or a V-7 or whatever. Don't throw out tired raw vegetables. Salvage all you can by juicing or blending them. If you don't want to drink (or eat) the result, use it for a soup base. Freeze it for another day if you like - just don't throw it out.