More to explore:
Could I possibly knit our headboard (make a sleeve to fit over some wood)?
diy headboard by adrian
Book Headboard - DIY
Isabel Wilson's Tiered Bookcase
I could make this headboard. Make a wooden frame with a second thin board to insert - cover with light padding and fabric - would be easy to change the fabic if you want to change the style of the room later.
Build a geometric cutout headboard. (you'd never guess that the DIY version is made from decorative doormats)
DIY bedroom shutter headboard. Christmas lights in headboard