This is ingenious! John Flynn's Diagonal backing calculator helps to minimize the amount of fabric needed for your quilt backing. (Flynn was a bridge-building engineer before he became a quilter, and you can tell it from his great tricks.)
Gypsy, by Michael Miller Fabrics. I love this idea, what a great way to use a bold large scale focus fabric and the coordinating small scale prints.
Double Diagonal Backing - técnica que pode ser usada quando não houver tecido de forro suficiente. No mesmo site, outros exemplos de corte. Útil.