When I was making my BOM for Pam Bono's "Pieces of Baltimore" (with almost 5,000 pieces in the quilt & some of those were tiny!) - that is what we did with the patterns each block. We would have gotten lost otherwise! Plus you didn't mess up your pattern just in case you wanted to make one of the same blocks for a different quilt in different colors. Kept our BOM patterns and the working copies in a 3-ring binder.