"That's not interactive, there's no back-and-forth with the other player and how much fun is it to watch someone incredibly good at moving their eyes? And then whichever Seeker gets lucky swoops in and grabs the Snitch and makes everyone else's work moot. It's like someone took a real game and grafted on this pointless extra position just so that you could be the Most Important Player without needing to really get involved or learn the rest of it. Who was the first Seeker, the King's idiot son who wanted to play Quidditch but couldn't understand the rules?" Actually, now that Harry thought about it, that seemed like a surprisingly good hypothesis. Put him on a broomstick and tell him to catch the shiny thing...
I think they're called Mosaic beads, or just plastic beads... I haven't been able to find anything like it on the English wiki, though they do have a picture file in the wikimedia commons http://upload.wikimedia.org/wikipedia/c ... beads2.jpg
Basically, you put the beads on a square pattern of nubs, iron them thoroughly, put on some lacquer if you want to, and voila, done.
If you're planning on going to PAX East next year, I can bring a bunch of beads with me. They're cheap as hell over here and come in all kinds of colors.