Personalized Vows

we will be writing ours, too. our officiants suggested the following:
keep it short. if it sucks, you won't put your guest through a long thing and if it is amazing, they will remember it.
also, they suggested that we write a letter to our SO, and if we are tremendously nervous, they will read the letters for us. something short, sweet, to the point.
i have heard of people stringing together song quotes, too.

I don't know if this will help but this site has sample vows.
http://www.documentsanddesigns.com/index_pages/vows_verses_index.htm