Those pictures explain it well. You would have to be careful when picking your front block pattern so that your sashing / binding doesn't interfere w/ the block design. It was perfect for your "whole cloth blocks". I bet it would be great w/ applique blocks too. I think it would need an extra step for most pieced blocks, I think if the pieced block fronts had a narrow border added before sandwiching that would take care of loosing points and patterns in the pieced block.