I used piping or maybe it was considered a flange (not sure of the difference) on a quilt I made. The color of the sashing was too close to the background color of one of the focus fabrics so I used the edging between the sashing and the main fabric. The only down side is that while it is very visually attractive it does create a "ridge" that makes the quilt less snuggly. Since I used a very fluffy fleece for the backing the other side not being as snuggly was not an issue.