Make your own Insta-face mask, whether or not you post a pic of yourself wearing one. Masks-- especially one- use sheet masks-- are the latest craze to sweep the beauty industry and a fun addition to any skin- care routine. But the costs add up and the ingredient lists are often riddled with parabens and preservatives. (Think of the environment, too, with all that packaging!) Here are 101 recipes that are easy to make and often use only a few ingredients...