Mostly do what the quilt says it wants. If it needs a fancy border I do that, but lots of times all the quilt needs is a quiet border to frame the work. I do use "piano keys" a lot though. Usually have strips of fabric left over and just cut into 2" strips and length that the quilt needs, usually 4" to 6" strips. Then do a square on the corners. Also will sometimes use scraps from the quilt, cut them 3 1/2" and sew long ways. Then just fit that to the quilt edge after a small 1 1/2" stop border.