I am not a SBS fan, but I love yours. I think I would use the cream and do the small zigzag. I like the blanket stitch but fraying is sometimes an issue when something is washed often. To me, the perfect color for the sashing would be the soft golden yellow that is in so many of the dresses/hats. The green would be very springlike, but cool. The golden yellow would warm it up like the soft afternoon rays of sun.