Cut varying sizes of circles from your material. The great thing about this is that the petals don't have to be a perfect circle. They won't end up that way once you burn them so don't worry about it! Hold the edges in the flame until they start to melt. Don't hold it too long or it will catch fire! When you have the number of petals you want start gluing them together in the center. Add your embellishments to the center. Glue to the hair clip.
For variation use more than one color. You can also add tulle to the flower.