I think if it were me, I'd put a small border around it first either in light or dark shades, actually maybe a lighter shade of purple because of it being light. Kind of to just draw attention to the candlewicking. Then go ahead with the triangles that you like and use maybe a little darker purples and even draw some of the lighter shade in there too. Think it would look nice from light, dark, light....kind of always bringing it back to her center and then bind with a color as close as you can get to the center to make the eye travel back to it. Might help if you pull the fabrics and just lay out pieces around the center for your color in rounds. I do that all the time and it helps me to decide most of the time. Even stand across the room and look at it too 'cause other people will.