Buy a mirror. Put letter stickers on it. Paint over the whole thing. Peel off stickers. (use canvas instead of mirror. Paint canvas what color you want your letters to be first, then letter stickers, paint over, peel off)
Tutorial to take favorite quotes and put them on canvas. Staple down fabric. Use sticker letters to write the quote. Spray paint the entire canvas. Remove the stickers so the fabric shows through the paint.
Such a good idea as a gift for grandparents. Put a phrase or message in vinyl letters on a clean canvas. Have your child paint a picture on top, then peel the vinyl letters off to reveal the message underneath.