I am not a biker but i love researching themes. There is a whole website dedicated to biker weddings at http://www.twowheelweddings.com/. I don't know how far you want to go with this theme so I will put it all out there
If this is your first wedding, you might want to put more emphasis on wearing a dress. There are two piece dresses available. Later, when you want to ride off into the sunset, you can remove the bottom, and throw on your favorite, most comfortable blue jeans.
I don't know anyone who has, but I'm sure you can find similar weddings or other biker brides here: www.offbeatbride.com is the website/blog and here's the the community: http://offbeatbride.ning.com/ Hope that helps!