As suggested, add a border made up of blocks, maybe stars in red or blue with a white or yellow background since there are stars on the panel in yellow. I just made a baby quilt using a panel I had laying around and added a 3-striped border...teal, blue, teal to match the inner border on the panel. Was able to match the panel's color fairly well too from my stash. Its on the frame now being quilted as we speak.