MiMom ... you have a beautiful modern sampler there! While it would be nice to try the scallops, IMHO the work you'd do, just wouldn't have a chance to show on this quilt.
My thoughts would be to frame it up simply with a dark border. There's enough happening in the centre that you don't want to have your eyes drawn to the border, rather to all the different blocks in the sampler.
Let us know what your LQS friends suggest when they see it IRL.
LQS = Longarm Quilt Society? or?