Polyvore’s about page states: Polyvore is a unique, easy-to-use web-based application for mixing and matching products from any online store. Items are pulled together into a visual set of products that can be shared with anyone. Each product within the set is then linked back to the online store where it is available for purchase.
It is a lot more than that though. Jackie has been creating unique artworks all day.
Polyvore has an interface very similar to Flickr, so creative Flickr users will feel very much at home.