For this one, I used a gorgeous piece of black-and-white Chinese character paper and a piece of acid green bookcloth for the spine. The three signatures are stitched to a separate piece of the green bookcloth which becomes a hinge to glue the book block onto the prepared cover. Then the end papers are glued down over the hinge. For the end papers here I used a card stock weight paper with a nice pearlized and textured finish.
I'm pretty sure this general structure will become a staple in my books-for-sale inventory.