On your coat, in your sewing box, or sewn as eyes for a childhood doll. They're basic in need and can range from small and white to larger than life and covered in art. You collect them in jars, sew them onto anything you can, even make jewelry so you can have them on you at all times. And no matter where you go, if there's a section for sewing and crafts, you're there touching them all and thinking "I don't have any that look like this..."