I'd love to be an attendant in a wedding where the bride gives just "a few parameters and let each choose her dress." It's a great excuse to buy something new and cute that you actually like! I especially liked the look of the sparkly cocktail dresses.
I'd do this for my bridesmaids, but I'm not quite so loosey-goosey. :) I don't need them all to be "twinsies," but I would like my bridesmaids to "match" a bit more.