I agree that you should do a small inner border of the light to stop the eye. For the larger outer border - what does the backing look like? what is your favorite color? is it for a specific person? if so, what is their favorite color? if it is for you and you are putting it in a specific room, what are the colors for that room. You have so many great colors in the top that it really doesn't matter for the top, it can be based on the other factors.