On my next visit home, I took a peek at her room and upon first glance, thought she bought a new (real) headboard. It looked pretty good! And for a recent college grad still living on a budget, 30 bucks to spruce up an otherwise boring bed is a pretty good deal.
Of course, she scored on Etsy...here's a picture of the "headboard" from seller artwallproject's site:
I wish I knew about this before buying bedroom furniture for our guest bedroom...that room's relatively small and a sticker headboard could've created the illusion of a real one without sacrificing space.
I'll have to take a picture of my sister's room and post it up to show the results!