I'm always up for a challenge, so you're only limited by your imagination. If you don't see it, that doesn't mean I can't make it or haven't made it in the past. All manner of tent pegs, hooks, hinges, iron decoration, etc are available based on your design or idea.
For drywall installations, I recommend hollow wall anchors which utilize the plastic or soft metal base that you then screw into. They are available at your local home or hardware store.
For re-enactors: I take no responsibility for the accuracy of the items you order! If iron tent pegs weren't in common use in your time period I can not refund your purchase. Please check with your group's governing body before ordering.