My trip to the Niagara area last month included a stop to get more assorted pieces of bookcloth. We finally got the cloth stored in our rack and have some samples for making an updated sample sheet.
Those two that look black (second from left and near centre) are both actually very dark blue. Most are a lightweight linen texture, but a couple have a heavier smooth finish. We have about 3m of each of these, but some of them were the end of the roll and can be as short as ½m.