I always want my quilts to be reversible, so I try to use coordinating fabrics to what is pieced on the front. But, I'm a thrifty shopper, so if I buy the fabric at a shop for the front, I'll get online and look for the backing fabric at a discounted price. I can usually find coordinating fabric at least 40-50% off. I may have to wait a while for it, but unless there's a deadline on a quilt, I don't mind.