I used those quilted waves to echo the scalloped edge. The pattern was very vague on how to do the scallop, but I think it turned out well:
I quilted meandering loops-and-hearts in the heart and the borders, using thread matched to the colors on the front but a verigated pink on the back. This (very poorly lit)shot of the back (made of a plushy, Minkee-type fabric) gives you an idea of the finished quilting:
The quilt finished at an odd size — 53X62 inches — but it will be a great throw or cuddle-with-your-sweetheart blankie. It was hard to let it go, so I hope it makes a ton of money!