My sister does most of hers in black and border, I do most of mine in muslin, borders of contrast to top but many of mine are from 30's original materials, not reproduction stuff,If a quilt is white on the top I finish in white, I just finished one called The Journey, Hoffman fabrics, tourquoise backing and border, getting ready to quilt one soon, with white , top is white with maple leaves with green sashing , printed bottom to match the leaves, my sister made a double wedding ring not too long ago, hot pink around the rings her quilting friends thought she was crazy . she backed it in white, when it was finished , friends were quite pleasantly surprised, so looks like any thing goes,