This is the way I saw that it can be done if you have access to SU! circle and scallop punches:
- Punch a circle (1 3/8 circle punch) out of your CS that you want to use for your scallopped edge
- Now line the (SU!) scallop punch around the hole on the CS and punch out what will look like a scallop with a hole cut in it.
- Make just one cut on the side of the circle in between the scallops
- Now start opening and straightening the scallop to make your new decorative edge
Hope this helps!