Make Your Own Petal Cutters
If you don't have the proper petal cutter for making some clay flowers, you can make your own. See posts at The New Clay News for Making Your Own Cutters and a video with Free Cutting Tool Ideas.
Amazon also has a kit for making your own cookie cutters....which, of course, will also work for clay. Just look for R & M International Design Your Own Cookie Cutter Gift Set .