Polyvore is all about the time-honored art of shopping as a form of self-expression. Members choose clothing and accessories from the site's collection of items from stores across the Web, then assemble and share them as sets. They can also share items to answer pressing questions posed by other members, like "What should I wear with yellow shorts?" Fear not: Polyvore includes links to the items on the shopping sites that sell the items it features, but you aren't required to buy any of the things.