This is quit pretty - great job! Depending on a number of factors (sale fabrics, "likeability" of prints available), I'd do TWO borders (an inner and an outer). Since you have a lot of pastel with accents of dark green, I'd use a medium-scale medium-green floral print with pastel accents to softly bring out the pastels, and a dark green for the outer border (large scale or medium scale). It'd be a gradual color lead from the center out, make the colors pop nicely, while accenting the dark green units. (Just my opinion!!!)