Most impressive, indeed. At first glance, it looks remarkably 3D. I wonder if you could do the black lines with a fine pen, but the following white highlights would possibly smudge the ink...
I'm also fascinated by the surface effect. All the cork stuff I've found so far seem to have a rather prominent pattern (due to the growth patterns, obviously) which bleeds through all my attemps to disguise it other than textured paint.