Judging by your avatar, you are quite good at applique. I think this quilt would look super cute with a swag of vines and flowers on the top and the bottom. You can find a green that plays nicely with the greens in the top to make vines and leaves and use the bits of fabric you have left to make flowers maybe adding a little something from your stash. If you want to make it look more planned, you could probably extend the vine up the sides just don't have as many flower and leaves so it is narrower. This will get the quilt in a rectangle shape for you. I love your quilt BTW. Like QuiltE I am drawn to autumn colors.