Neat article... I remember struggling with this in the IsoSurface stuff. I had lots of test images at the time. I no longer remember if my solution was similar to any of these in the article but I did start from the GPU Gems chapter.
I tried to find some screen shots of the test patterns and stuff... but I'm having trouble. If I run across them then I'll follow up.
Edit... ahah... though I think these were while I was still working on it. I don't have a final "eureka" style image.