I have just finished my draw-dio pencil, and it was very hard to do so much soldering and so many little parts to solder. This was very fun to do and takes up a lot of time but at the end its very awesome how the electricity flows through our body and to the copper and pencil lead. This is a so worth it project I would say. Now going more into specific detail... A Drawdio is a Pencil that has a circuit board that we build and add it on to the pencil. What we used were these items: Circuit board, 2 capacitors, 2 resistors, transitors, ceramic capacitor, a chip that has a timer, speaker, thumbtack, wire, copper foil, and a pencil.
Here is a link to a page on the Drawdio: http://web.media.mit.edu/~silver/drawdio/