A. Make the flower exactly like normal. When you are done, cut a small square of tulle. Fold it into fourths and dab some hot glue on the fold. Press down into the middle of the rose to attach it through the fabric onto the dowel. Trim the edges if necessary. The look with this one should be jagged and asymmetrical, so you can cut the tulle to suit your needs.
B. Lay your fabric strip out and glue the open edges together as per normal. Cut a strip of tulle the length of the fabric and run hot glue along the bottom of the fabric strip (you know, the ends you just glued together) to attach the tulle. Now just make the flower as normal and there will be a tulle layer stuck in there. We all know you can never have enough tulle.