Several years ago I bought this stamp set of flower petals in varying sizes. I ended up making calla lilies with them, and they turned out wonderful!
I finally decided to do a tutorial on them. I made a video since it is easier to explain. The YouTube video tutorial is located here: https://youtu.be/V12K4LrUnhg. The PDF file for the petal shape is located here on Google Drive: https://drive.google.com/file/d/0B8C21IID_PWkd1k4SGtVWlRVR1E/view?usp=sharing
Let me know if you try these out and what you think!
