Recently we upgraded from a full to a king size mattress. One thing I didn't take into consideration when I chose a "king" was that everything associated with king sized beds are king sized in price. I ordered a bargain priced "hollywood" frame on with our Amazon Prime account. Got my moneys worth on that free delivery! Having a frame made the bed useable, but we really need a headboard I've scoured Craigslist....nothing. I'm a little picky and broke.....since I'm handy with wood....I'll make one. I've got interesting wood, but I did have to buy a nice 2x4 and some 1x3's. So far I've spent $11. I chose my desired height and cut the 2x4 legs to that length. I had scraps of plywood that was purchased for the hollywood frame. I used that as the main base for the wood that I will add so it doesn't need to be pretty. Attach with screws (they'll be hidden.)
I got this far and still didn't really know what I was going to create. I contemplated using 4 cabinet doors I had stashed away but it wasn't quite the look I wanted. I had built Ana White's Farmhouse headboard a while back so I knew I want a 1x4 flat on top so I made sure the plywood is flush with the top of the 2x4 leg. Always use wood glue at every joint. My rule is you can never have too much glue. Next I cut a 1x4 for each end. Glue, square and clamp.....then nail with whatever you choose to use. I have a 16 gauge Porter Cable Nail Gun.