I tried this on a placemat (started with something small -- good thinking on my part). Something went wrong, which isn't unusual when I jump in with both feet. The pattern I used showed where to put a consistent solid (like black) so you would have black in the corners and on the edges. Somehow, they were all cut small and it didn't turn out right.
We still use it, and it's a fascinating technique, but my two cents? Try it out on something small before trying it on a quilt!