I'm thinking that another set of background blocks entirely around to center up the sea horse and then next to that a thin border of the dark blue, then a thin border of the light blue, and then a thin border of the dark burgundy, followed by the background color (darkest one) as the binding. I don't know if that will make it two big/wide/long for what you want it for, but perhaps if it is, a lap quilt instead of a wall hanging since it is already so long for a wall hanging.