Wedding in Red – Perfect Marriage

I am getting married in winter and I want my colors to stand out I was going to go with wine red but my fiance is set on blood red and we know all know sometimes we have to comprimise. Now I decided to dress my flower girls in white with red organza ribbons and little flowers but the brides maids are a bit more difficult as I dont want them all in black but two bridesmaids are around 16 and I dont think bright red will be nice for their age. I was thinking of black dresses with white organza over the black to cut it or red over the black or red for older bridesmaids and white for the younger girls. What do you think will look better for their ages 15, 16, 25, 23?