I just finished a red, black, and white quilt top for a friend. I am left with lots of large pieces of fabric. I would like to piece a back for this quilt. I have one piece that is about 42 in. x 42 in. Thought I could start there, but not sure what to do. Have any of you pieced a back for your quilt? Did you use a pattern or just start sewing fabrics together? My quilt top is about 70 in. x 70 in.