To add ribbon ties, center boards on fabric, and fold fabric flaps over the boards on each side; crease along edge with bone folder. Remove boards. In the center of each side crease, cut a slit with the knife as wide as the ribbon you will be using for the closure. Cut two pieces of ribbon 5 inches long, or longer if you want them to wrap around book; slip ribbon through cloth slit until 1/2 inch of ribbon is exposed inside the cover. Apply white craft glue to the central section of the cloth framed by the creases, brushing over ribbon as well; position boards on cloth, and press down. Allow to dry. Cut across the four corners of the cloth, 1/8 inch away from corner points of the boards. Apply glue to one flap at a time, and fold over. Smooth with bone folder, and allow to dry.