bkay I love those blocks. I can see them in a setting with a sashing of a white on black fabric. It would spice them up tremendously. And, if you still don't really like it, try adding some bright butterflies flitting about.
http://1.bp.blogspot.com/-Y0fyiG5Use...w/s1600/b1.jpg
These are some examples of just black sashing.
https://www.bing.com/images/search?q...=1&cw=1129&ch=
Or...maybe sew all the blocks together, then use it as a background to make a colorful flower garden.
https://www.meissnersewing.com/media...10117_lw_3.jpg
You have such a good start to ending up with a fabulous quilt.