I personally like even a small border in a dark color. Your quilt is a work of art, most art work is matted and then framed to highlight the intrical colors inside the border/frame. As others have said not having a border is a personal preference - but try putting a darker color (layng it underneath) and then step back around the edges and see if your work doesn't pop! A dark binding helps too but they aren't quite wide enough.
It is a lovely quilt and if you would like some assorted scraps pm me, I have some waiting for a good home like yours :)