Cereal canisters make the perfect rubbish bin for your car.
Use a (clean) dustpan to fill a container that doesn't fit in the sink.
Place a rubber band around an open paint can to wipe your brush on, and keep paint off the side of the can.
Use a staple remover to save your fingernails when trying to add things to your key ring!
Use a comb to keep a nail steady for hammering.
Use a micro-fibre cloth to prevent frost from forming on the windshield.