The latest development I have been working with, helped by my willing students, is a form of stitching/weaving or twining of thread into stiffened book cloth that decorate the spine as well as the covers.
We created the spine unit separately and attached this to a hollow backed text block.
The final covers were completed separately and attached as laminated boards.
One book is completed. Not only is it interesting to look at but the threads give a textural effect which we found very pleasant. We were all happy with the results