Since everyone else is doing it... I made these this weekend. The blue and white one is a single-needle Coptic binding described in Keith Smith's Volume I Non-Adhesive Binding: Books Without Paste or Glue, and the red and black one is a four-needle Coptic binding described in his Volume III Non-Adhesive Binding: Exposed Spine Sewings.
The red and black one saw the last of the leftover paper from the concertina project. It looks nice but it is very heavy and fibrous and was a sucky paper to work with - the fibres came off on the brush when gluing, and dyed the glue, and it bleeds when it gets wet. The blue-and-white patterned paper is a very nice Italian paper I found at Paper Source.