You did do a great job on the piecing and I am guessing you like pink since I see pink shoes in the photos!!! The fabric is really beautiful! So, a white or off white border would be great as others have mentioned .... maybe even two white borders with the outer one being wider and a thin pink strip between the two? I was thinking you could do curved quilting from the outside point of the star arching slightly outward and coming back in to the side points where the each diamond meets up with the neighbor diamond. So you would have 16 "arches" going around each star with hopes that that would set them off and making a sort of flower pattern. Then quilt all the areas outside the star with a denser pattern to make the star stand out some. I am hoping this makes some sense but maybe not. Some quilters use a plexi-glass sheet to lay over there blocks and then draw designs on the plexi to sort of audition a quilt pattern. Use a wipe off marker and you can test out different designs. Good luck. I am sure that you will find a solution that will make this a beautiful quilt!