Some of you posting are not understanding the issue -- you use half the zipper, as in one side of the tape, to make a bag. That leaves you with the entire length of the zipper, one side of it only, unused. Since I would never use a flower rosette, that would be waste for me.
Fortunately, it is possible to get extra pulls, and it can be a fun design element to mix and match the color of the pull with the tape/coil.