Originally I chose only my 2 sisters to be my bridesmaids since they were my sisters and easy choices. But I wanted to incorporate a couple other friends and didn't want to "honor" them as ushers or cake cutters so I made them bridesmaids.
About a week before I asked them to be bridesmaids my mother went to a store and picked out bridesmaid dresses for my sisters without sending me a picture first. I had told them that if they went shopping and found a dress they liked, they could send a PICTURE to me, and if I liked it at that point, they could buy it. I also said that I wanted all the bridesmaids to wear different dresses (OH, the horror!). My mom went and bought the dresses for my sisters without sending me a picture. (Sisters are unemployed students) Finally, when I see it I say "fine, its okay" just to be civil since I was busy at the time. (It's easier to be civil since I'm stuck living with her until the wedding and she calls me names and treats me like crap when I don't agree with her--its like rationalizing with a 2 year old. Also, its not like I can get a refund at that point)
I asked my bridesmaid to come over to go dress shopping. My bridesmaid came in the door she asked my mom how she was doing and my mom said to her "I'm annoyed at bridezilla and think you shouldn't be a bridesmaid since you don't match." At this point my bridesmaid starts worrying that she isn't wanted in the bridal party and if I just want it to be my sisters I should do that. (Note: I originally wanted only sisters since my mom said sisters are the only people around 50 years from now that were in your life at the wedding....)