here is an example of a simple ruling pen
If you decide to try this I recommend using very high thread count cloth, something that I (ahem) learned the hard way. A typical course of action for me, sad to say. I taped my square of cloth to the work surface to prevent shifting, and found that holding the pen in a consistent angle to the cloth gave me better control over my marks.
Incidentally, I have a new website! Please stop by and take a peek, and leave a comment on my blog if you have time.