I have had a few of these gigantic buttons in my stash for years. I did a bit of craft room cleanout this weekend and decided to stop hoarding one of them ;-)
Here's what I used for my 4/25" square card:
Stamps: A muse
Paper: SU very vanilla, Basic Grey Lilykate
Ink: Palette hybrid noir
Accessories: a gigantic button (can't remember the source), SU grosgrain ribbon, paper piercer, corner chomper, circle nestibility