I know how to draw straight lines but could I draw a line which http://img163.imageshack.us/img163/2320/path3003.png (around a straight line i.e.)?
Excuse me, I do not speak English very well to describe this more detailed ;-)
Edit: Hey sorry for my late answer - you are right, it should be something like a sine wave which "vericulates" and looks like a worm "coiling" (right word?) around a simple spline/curve (drawn by the user).
The "Noise" version looks a bit too random.
The wave should look like this image.