I just read an argument against trying to personalize your wedding with new traditions and self-written vows over at Double X (thanks, Jessica, for sharing!). There's a whole lot of judgment (both in the piece and in the comments), so be forewarned that it's a bit of a Debbie Downer.
And as a couple who wrote their own vows and wedding ceremony and choreographed a first dance with our entire wedding party, Matt and I clearly don't agree with the author. Writing our own ceremony and vows helped us connect more deeply with our commitment. As for the dance, it was just a way to have fun and celebrate our love with our friends and family. One of my favorite wedding weekend memories was practicing the dance with our closet friends (and I love the look of shock on my grandma's face--see below--when we performed).
I do think it's good to expose oneself to different opinions as a way to help you clarify your own. It's definitely worth a read.