How about a pieced border? Some of my favorite easy pieced borders: 4- or 9- patch, hourglass or, a bit more trouble but not bad, pinwheels. Calculate how much you want to "grow" the top, how big your pieced borders need to be. Put in a coping border of the gold or red if needed so that your pieced border will fit well. Then you could add another plain border if needed to make it larger still.