When most people think of arts and crafts, two images typically come to mind. Some think of the classic church basement craft show where retired ladies hawk doilies. Others might remember second-grade art class, where they made handprint turkeys and might or might not have eaten paste. But what about a marketplace of young urbanites buying and selling items like handmade books, yoga mat bags and vintage jewelry that draws a crowd of thousands? That's exactly what goes down at the Crafty Supermarket.