This project is pretty hilarious if you’ve got a hunter in your life. Over at Instructables, you can see how to make a wreath from shotgun shells and a lighter designed to look like a shotgun. While the tutorial uses live shells, I would imagine empty casings would work as well.
This wreath was designed as a festive Christmas wreath with red and green shells; however, I could see it used as year-round décor for a man cave. It would definitely spark some conversation with guests.
Find the tutorial at Instructables.