Photograph by Pablo Zuleta Zahr:
I saw Zuleta Zahr's work earlier this year in Aperture's reGeneration: 50 Photographers of Tomorrow exhibit and was fascinated by the patterns created by the subjects in his pieces. What's even more amazing is how he got these images. The Chilean photographer set up his video camera in the Santiago subway and shot for ten hours at a time. Then he arranged the stills in color-coordinated patterns, making sure no person appears more than one time.
The image above, "Chilean Women in Blue", is my favorite. And it's available though the Verona gallery Studio La Città(but I've been too scared to find out the price.)