I' was just in a wedding two months ago where we picked our own dresses. However, a couple of the girls, myself included (there were 9 of us), felt we needed... more stucture, more guidelines to pick a dress. The bride was basically like pick a dress you feel pretty in, in X color and X length. For some that seems sort of easy, but for myself it was more frustration and nerve racking. In the end, I ended finding dresses for 4 of the girls, myself included. It ended up looking super pretty.
My dress was not from there, but if you are looking for inexpensive BM dress suggestions in similar colors, a couple of girls found them at target which now has a BM line.