There is obnoxious eco-friendly (like using a diva cup) and there is adorable eco friendly (like having your wedding invitations be made out of wildflower seeds). One of my best friends from Kansas is most definately adorable eco-friendly.
Her wedding invitations can be planted in the ground and will grow wildflowers. What a brilliant way to have your special day keep on giving!
There are tons of places online that sell this paper like, the Botanical Paper Works. Or there are a few tutorials so you can make your own. I wish I was this thrifty.