That is a really pretty quilt. I made one using those colors that was a Craftsy kit called Night Stars. The colors look very similar and it too had a black background. I had it long-arm quilted and we used a bright neon green color with a star pattern. It turned out beautiful! I loved the neon and the bright green really made the quilting show up well on the black especially. You might make a small quilt sandwich with some scraps and try the neon green. I think you would really like it. Good luck with your finish!