This question has options. How would someone go about accomplishing this goal?
Make a headboard for a Queen sized bed.

Available choices:
(i) Find out where you want to put the bed in the room and then using indoor Paint paint aa pretend head board on the wall where the bed will be going. Great idea, you can make many different designs as time goes on..
(ii) Use an old stockade fence section and cut it down so that it's the height you desire for the head board. Attach it to the wall where you will be putting the bed. Move the bed in front of it..
(ii)