More to explore:
Metro Card Collages. As the name suggest, metro card collages are made from cut up pieces of used and expired MetroCards® – New York City subway tickets. All artworks are one-of-a-kind and vary in size from 5"x7" to 40"x30". Nina Boesch uses the front of MetroCards® for color collages (yellow, orange, blue and black), and the back for grayscale collages (black and white).
Water Tower Skyline, 2012 by Nina Boesch- mosaic of metro cards
Specializing in interaction design, Nina Boesch essentially makes digital devices play well with humans. In her spare time, she collects MetroCards from the floors of New York City subways for collages like this one. Read more about Boesch and her work on the Visually blog.