Cat food and tuna cans also make good coiled-cardboard + wax or grease Buddy Burners.

If you have some fat candles, they make good candleholders, esp if you push a short nail into the center from the bottom.

Larger cans can be used to collect berries and other edibles. Poke a hole in each side and make a wire handle to hang on a branch while you work, or even put it on your belt.

Regular vegetable cans can be perforated and turned into candle lanterns. Even if you can't read by them, they can mark the way to the privy in the dark.

Emptied and hung on strings from a post (in a cluster), they can warn of giant underground worms.

Shiny aluminum can lids can be hung on strings over a garden area to scare off birds.

Keep the young kids busy with a can/string 'telephone'.

Used to be able to bake bread in cans, does anyone know if it's safe to do so now?

Aluminum cans - if alcohol fuel is available, make a few alcohol stoves for the neighbors in a power outage.

Aluminum soda and beer cans with the tops and bottoms removed (depending on height) provide 30 or 43 sq inches of lightweight, shiny (reflective) sheet metal.