I used a zigzag stitch around the edge of each of my petals. I used a shorter stitch for the thin men’s shirt cotton and a longer one for the tweed and quilted fabrics.
To assemble your scrap fabric flower, all you have to do is lay out your petals in the design you like and pick out a pretty button (or several) to finish it off.
Depending what you plan to do with your scrap fabric flowers you can choose to add a backing to finish it off.