For my first book, I chose to use some card stock and copy paper I already had on hand. I didn't want to get anything special because for me, it makes mistakes more traumatic.
I know that corner is hilarious--I started working ahead and made a mess of it. The other cover came out a bit closer to what I was after, but I still find the corners difficult.
I'm looking forward to making many more coptic stitch books! The sewing part is so relaxing.
Thanks for another great class, Caleb!