For more colorful rainy fun, sprinkle a few drops of food coloring or tempera paint powder onto a paper plate (or ​other sturdy piece of paper). Take it outside and let the rain give you watercolors. You can swirl the liquid around to make designs. Bring the plate inside to dry, or press another piece of paper on top, then peel off to make a print. On a warm, summer rainy day, dress kids in swimsuits or old clothes, then send them outside with washable or bathtub paint. They’ll have purple legs, green arms, and polka-dotted hands in no time. You can also bring bath toys or other water toys outside for rainy-day play. Clean them with warm, soapy water when you’re done (or better yet, let kids do it).