If I know who the quilt is going to, frequently I'll piece the label into the center of the backing and treat it just like any other pieced backing - that way I avoid the hand sewing part (my hands really hate it). If I have to do a label after the quilt is quilted, I'll take a square, fold it in half diagonally and put it in the corner - I'll sew it on when I sew the binding on by machine and I'll have only one side to hand sew and the triangle looks cool in the corner!