I usually make the backing totally different from the quilt top. If it is a summer like quilt, I make the backing either a fall backing so that you can just flip the quilt over for a longer time period. Or if it is a fall quilt, I might put snowflake or Christmas design for the back (one is white with small Christmas presents on it), etc. I try to make each quilt with a major theme and the backing something that can be flipped over - two quilts for the price of one!