Back when I took nuclear physics, we had access to lead bricks used for shielding. We used the bricks for other than their intended purpose, such as building blocks, paper weights, and writing utensils. Lead makes a pretty respectable pencil, providing you don't mind the toxicity of the... well, lead. If you liked the look of lead with the inconvenience of the brick,

Geekosystem reports on the release of an inkless pen that works on the same principle. The pen uses a metal alloy tip, which writes by leaving metal on the writing surface. The pen works upside-down and underwater and leaves an indelible mark. The pen (really more like a pencil) does contain lead and other metals kids shouldn't be eating, so it is recommended for adult use only. If you're interested, you can get your very own inkless metal pen from Vat19.