At the link you will find complete instructions to build your own upholstered headboard.
This headboard arch half-pattern makes getting a symmetrical finished piece automatic. The dimensions are for a queen-size bed. The patterns are available to download at Woodsmith.
Before you start, it is a good idea to measure your bedframe to make sure it will line up with the posts. The free arched patterns are available to download at Woodsmith.
At the link scroll down to the furniture section and click on headboards. Dimensions courtesy of WorkbenchMagazine.
Build a bookcase style headboard using the dimensioned drawings at Matts-Workshop.