I put in "lippy's" (as Lucy from the Quilt Rack in Ancaster likes to call the flat piping between seams) of dark green around the center blocks which tied the narrow border in well. The quilting in the center triangles:
The diagonal grid in the border was great since I could follow the lines of polka dots:

It was difficult to decide on quilting for the four patch blocks. I didn't want to take away from the blocks. A friend suggested a curved line. I put a dot 1" away from the edge of the block in the centers of the four sides and 'eyeballed' the curve...worked great!
A closeup of the quilt motif in the triangles:
This quilt was pieced and quilted on my trusty Singer 15-88 treadle. The free motion quilting was done on a Bernina 830 that I just picked up and had to take for a test drive :-).
I have a vintage walking foot, affectionally known as a penguin foot, for my low shank Singer machines and this foot does a fantastic job of stitching in the ditch. 
Here is a side view...doesn't it look a little bit like a penguin? :-)

















