Thanks Dunster, I think I'll try that. I was kind of thinking of a "surf to sand" sort of look but there are a ton of possibilities. I think maybe I need to stop looking at it for the night and come back and see what I think tomorrow. After a fiddle a little more, of course. LOL
I did save an extra panel that I'm going to center in black (and maybe blue, if I use that on the front) for the backing. If nothing else, THAT side should look good! I am REALLY fond of this panel, I might have to order another to make a wall hanging for myself, I like it so much.