If you use food from cans (and who doesn't, now and then, anyway), don't just toss the can when it's empty. Whether it's a small can, like a tuna or cat food can, or a large one, the label is paper. Tear it off, trim the ragged torn edges and there you have a piece of paper for lists or notes.
Then wash and use the can to hold other things from candles to pencils to paint brushes. More on tuna and cat food cans later.