Well....if I were to quilt it myself...I would maybe quilt Charisma Curls in the white area with white thread and the black area with black thread....it will make fabric designs stand out...the little swirls would work as well. A little trapunto may be nice on this as well....on some of those bigger flowers and the butterfly??
In the borders...there are several options, leaves, flowers, feathers, anything to compliment the center panel.
If you are quilting this on your DSM and you are not comfortable with my designs....A small stipple in the black and White around the elements are very effective or echo quilting....the borders you could quilt any design you are comfortable with....I would just make each border a different design to breakup it up and add texture. :thumbup: