You probably don't think, "this'll sell for thousands of dollars!" as you toss packaging or a bottle into the recycling  bin. But many artists look at discarded materials in a different way — and have capitalized on the low (read: no) cost of this particular type of "art supply." Turning those scraps into beautiful and profitable works, artists from sculptors to portraitists are using trash to create their masterpieces. (Text: Sarah Berkowitz)