A few years ago, I purchased from white porcelain animal pushpins for my office. To date, they're my favorite piece of mini decor in that room. One recently broke, so I was elated when I came upon this tutorial to create your own!
A few packs of push pins, a pin board, a dash of inspiration (and possibly a little too much time on your hands at work) And Voila! Gloriously geeky wall art! It's Mario. And push pins. And genius. Golf claps and whoop whoops to you, clever chaps at the Student Computing Center at the University of the Fraser Valley.
Personally I just don't think I'd have the pushpin-application chops to do this freehand like these guys, but maybe some square lined paper would keep things from going wonky.
Have a peek at the close ups, they really are pretty awe-inspiringly marvelous