Oh my, love these... check them out! This idea was inspired by a post I read on Green Wedding Shoes, one of the most amazing wedding blogs I've ever read.
Here are a few dresses that I think would work well for bridesmaids:
Anthropologie(love the flower!)
These boards also feature patterned bridesmaids dresses: Alternative Wednesdays #1, Inspiration Board #54, Inspiration Board #19, Inspiration Board #11