I was intrigued to come across this video clip of a portrait made with 15,000 push pins.
The music is the artist's own composition - details are provided at the video's YouTube page. Here's how he produced the image.
Looks like a lot of work! I don't know if I'd have the patience to push in 15,000 pins like that, one at a time . . . not to mention sorting through 50,000 of them to pick out the colors I wanted!