Silver for weddings is traditional for a 25th anniversary, but for this, I'm honoring new marriages, with hopes that they will be successful long past 25 years. Skulls are a perfect fit for weddings, since traditional marriage vows include "til death do us part"...though of course that isn't true of all marriages. Regardless of the length of any relationship, life is short and you should enjoy each day like it's your last.
I found this etching/scratch art paper and knew it was perfect for a skull. It's been a long time since I've used this paper and it was still finicky to work with, but I like the rough silver outcome. The tool has a pointed end with round edges, but it depends on the angle you use it as to how well it will scratch. Scratch too much and you will tear the paper. Even though it's finicky, I do suggest giving it a try. I don't have a tutorial for this technique, but I did find this video of a Scratch Art show, that does show artists using scratch art to make amazing pieces. There are a few skull pieces in the gallery.