More to explore:
Could I possibly knit our headboard (make a sleeve to fit over some wood)?
diy headboard by adrian
Book Headboard - DIY
DIY bedroom shutter headboard. Christmas lights in headboard
Build a geometric cutout headboard. (you'd never guess that the DIY version is made from decorative doormats)
DudesThatKnit - Knit Inspiration: cosy blanket blogged on 79 ideas
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.
Painted Sign Headboard
Make an awesome headboard for twenty bucks! Would be fun to spray paint the foam tiles a bright color
chunky knit blankets
MDF Headboard Project