I think hearts and flowers are perfect for this quilt, myself. Hearts around the sunbonnets and a continuous line of daisy chains on the borders. Then again you could do an all over pretty design. Depending on how much work you want to spend on the quilting part of it.
Have you ever read the book, "Machine Quilting Solutions", by Christine Maraccini? She goes into lots of information about quilting. The hows and whys of qulting. The reasons for lots of quilting or just a little.
The other one that is good is an older one that you might be able to check out of the library. "Quilt IT", by Barbara Chainey.
BTW sewnsewer ... I love that santa quilt wall hanging. So nice.