I have both the pumpkin and pointsettia runners almost finished. They do look stunning. I will try to post pictures later.
Thimblebug - my double needle does not cause a serged look on the back. Just looks like double line of straight quilting. Do you use two threads? I think if you use one thread and take it through both needles, that may cause the serged look. Try separate threads for each needle. See if that works.