Have you tried magic writing on bananas yet? This is a perfect time to try it. Using a toothpick, gently write your message on the banana peel. Within an hour, the letters will grow dark and clear. To "color in" a drawing, use a blunt toothpick or another dull tool to press on the peel, without breaking the surface.
It's a great surprise for the fruit bowl or the lunchbox — kids love it!