Patti, I made an "underwater" quilt last year with one of the Supernova fabrics. Are you using the "rocky" one, or one of the starbursts? If the "rocky" one, you could consider adding some borders, maybe of blue then black Stonehenge fabric. That could add to the underwater rocky effect. I added algae by using some green metallic tulle, and I covered the entire quilt top with a dark blue tulle that had some sparkle to it, then quilted it with metallic thread. If you add borders, the tulle overlay could help blend them with the Supernova a bit. If you'd like to look at mine, I posted it last November with my other "finishes" for 2018. I think you could search for it.