Option 1, without the hearts. Use Rose L.s suggestion to put feathered hearts stitched in white in the snowballs. For the quilting on the rest of it, I would use blue thread. (The color that is sold for repairing denim pants; it's neither light nor dark and I think would blend with both shades of the blue). Beautiful quilt, and I am sure we are all demanding pictures of it when it is finished. (Lucky Sister!)