Another thing if you're wanting to display them, you could get a standard picture frame from Wal-mart with matting, and a complimentary background backing.
You can arrange the pins in which ever arrangement you like, in that case, there was a total of 54 pins so I made 3 of them up in groups of 18.
The backing is just cardboard which you push the pin through. The little black things behind each pin are little pieces of felt that help to keep each pin in place (they do tend to slide around if there's no felt)
Hope that helps.