For the actual wedding ring, I think something along the lines of it's a forever commitment that you never take a break from. Rings are impractical, get caught on things, and are far too easy to take off. So I am in favor of the wedding band tattoo. Get each other's names tattooed around your ring fingers or something like that. I'll leave it up to you guys to determine how serious I am about that and how much that is just my crazy mind at work.
PS. If anyone actually does this, I want to see the pics.