I've always dreamed of having my sister and my husband's (whoever he is) sister as our bridesmaids. They would be dressed as Madonna in a cheap, tarty, 80s wedding dress and they'd walk down the aisle to Like a Virgin and give us away
As for first dance, easy - 'Edelweiss' from The Sound of Music. Everyone would have edelweiss table centre peices.
Girls Aloud: Only 5 years until their 20th anniversary reunion tour! (and only 5 years until I can change my signature...)