You must be talking about Tasymo's blue bench and her beautiful red/blue shed. She's on the Garden Junk side. You can do a search for benches or sheds. I have just started visiting this side a few days ago, and wonder why it's so slow. GJunk side is very fast-moving.

Some beds come with footboard optional, so you should be able to buy just the footboard. I saw a couple on eBay, and on wayfair i think, but they looked very low. Why not go for a low upholstered headboard. Or check used furniture shops and restores for something you wouldn’t mind discarding the headboard. Or make one. I made an upholstered headboard out of a used hollow core interior door. I cut the corners in a radius with a jig saw and covered it with foam, batting and fabric, and attached wooden legs to raise it to the correct height and make a place to drill holes to bolt it to the bed frame. Plus the simple shape was easy to make slipcovers for so they were washable or just for a change of scenery. Cheap and dirty fix, but it served for 10 years until we bought a better bed.

Reclaimed wood headboards are everywhere ! That is nothing more than that, in your photo _ parked in front of a "hidden" fireplace and mantel. Just use your Google .......... " Reclaimed wood headboards"

Have you considered a black metal?