The following photomosaic is made up of almost 15,000 images contributed and assembled by several of my CS friends (click to enlarge):
The full-size PNG takes up 86.1 MB and measures 6,000 pixels wide by 9,009 pixels high. The small portion below shows the constituent images at full resolution.
The source image and many of the constituent images come from when when Josh, Alejandro, Zack, Lucas, and I traveled to New York last Christmas. Josh, I am told, contributed many additional pictures, and Alejandro created the mosaic using