One of my favorite quilts is a quilt top I bought some years ago in an antique store in St. Augustine. It was torn in places and it had some rust spots but the log cabin top was really a scrap quilt. Some of the logs have 2 or 3 pieces of fabric in different shapes and it was all hand quilted. I repaired the top, added scrappy borders and quilted it. Everyone comments on what a beautiful quilt it is. Now I can't remember which pieces I replaced and which were original. I say use what you have and the logs don't have to be even as long as the finished block is trimmed to the size you want.