Michelle Williams of Quail (which, p.s., is rad) just launched Quail Bridal, focusing exclusively on bridesmaids. She says "Bring anything that has the exact color you are looking for, whether it be an umbrella, a t-shirt, a sock, anything! And we will find a match."
I happen to think this one would make a cutie-pie wedding dress in white. *Update: Or blush.* Now for fuck's sake can we call a moratorium on balloons? Balloons are so 2008.