These days invitations can be too sophisticated & boring
I love how you can be more quirky & fun with them now, like the idea of having a small logo for the couples initials which can be carried throughout the matching accessories. (image 1)
or the use of the letterpress technique in image 2, yes its more expensive but defiantly worth it.
Some modern graphic styles of invites can be quite striking with little work & detail (image 3)