If you are looking for a good platform bed with interchange-able headboard fabric, the Beam Platform Bed by Shimna might be the perfect choice. You also do have choice of getting the bed without a headboard but it might be a good idea to get the headboard to match your bedroom.
This is my favorite btw, I might get it when I get my new house soon.
Available in Queen and King. In walnut. Wide choice of fabrics available for an upholstered headboard, or choose a walnut headboard. Base price shown is for the platform bed without a headboard.