Really nice scrap quilt. I'm not sure about sashing for it. Lay the blocks out on a piece of red fabric; then a piece of blue fabric, etc and see how it looks. You can get an idea of what the sashing would look like by doing that. I think it might be fine without sashing. Put the blocks closer together and see how it looks too. For the inner border, I think blue or red would be good.
Your quilt is definitely not ugly. It's just a beautiful scrappy. :thumbup: