Your quilt is so very pretty!!!! I love your colors! I love your borders!! I would think SID in the borders; echoing around the flowers, but change thread color to match the background (I know - a lot of changing thread, but you could do all the white background blocks first, then come back with the colored threads) Pop in a butterfly or a hummingbird a few times on the background fabrics. Have Fun, this quilt looks so cheerful!