I'm working on a very large book for a custom order. At 8.5 x 11", it's the largest book I've used a coptic binding with. To make it secure, I'm using multiple rows of stitching. It's one of my Rebound Journals, using covers from an old unwanted book, and with such a great title!
Also, my Peace Poppies Journal is in the TransCanada Etsy Team's November Challenge: Red for Remembrance. Stop over at the team blog and vote for your favourite item.