The David's Bridal Vera Wang collection has some beautiful dresses that I think are trendy and don't make your BM's look terrible at all. My girls love them and we will be ordering them the VW collection when it comes time to order soon.
I would avoid looking at "bridesmaids" dresses then. Try department stores like dillards or macy's and just look at formal/evening dresses. Often they have things that are a little more "in style" or trendy and just look like cool fancy dresses instead of screaming "bridesmaid".