A pen is currently out on the market that enables you to write without ink. The Metal Pen over at Grand-Illlusions.com is 8cm long and is made of stainless steel. It can write on almost any type of paper, and there is no ink nib. When written on normal white paper, results were pretty good.
The pen gets its inspiration from the medieval times, when pens without ink were used. Famous painters (like Da Vinci), used a silver-based pen similar to this pen (although this one is metal). The website also claims that if used on printer paper, results will be similar to that of a pencil, and that the writing cannot be smudged.
Grand-Illusions.com is currently out of stock of the $30 item, which usually comes in a metal tin described as "very smart, circular, and silver, and would make a very unusual gift".