If you need only a little bit of house paint to save for touch up down the road, try this upcycling idea: Use old plastic water bottles. Place a funnel on the top of a clean and dry bottle. Pour leftover paint into the bottle until it’s about 95 percent full, remove the funnel and toss in about 6 glass marbles. Screw on the cap and secure it with a few strips of painter’s tape. When it’s time to use the paint, shake it -- the marbles will blend the paint, and you’ll be good to go to paint down the road.