Family Limos--SPECIFIC QUESTION

I was wondering...we are in the process of booking some limos for the guests in our family (I am not speaking of our parents, but actually other family members like grandparents, aunts, uncles, guests..etc. ) Does it matter what color limo they get? Should it be white? Should it not be white? Does it matter? Usually the BP and bride/groom are in white limos i know, so what would an average guest get.....i am so confused about this. Do they book a white limo or a black limo? Is there any ettiqutte on this?
Thanks!!!!

You are the bride, totally up to you. Some people may want the bp to stand out so only they'd be in white w/ others in black, but totally up to you. You're the boss!

it really makes no difference. just make sure it's clean, insured and stocked with lots of booze