This feature in it is because of presence of a curved headboard and footboard that is outwardly curled at each end’s top. This footboard is often found to be shorter than the headboard. History records suggest when these were used traditionally; it did have a feature imbibed in it because of which it could curl inwards as well as outwards. Those days they were known to be made of wood. The popular practice during this period was to place them in the centre of their rooms. The objective behind this was to highlight it as one of the primary pieces of furniture of that particular room. Generally, people took immense pride in showing their prized possession.
For a more relaxed atmosphere, you can find colors from whites, ivories and creams to pastel shades of green, blue and pink. Also look into choosing a fabric that matches other fabric colors in the room. As opposed to the more sedate, "sleepy" soft tones, don’t be afraid to venture onto the "dark side" and choose a darker and heavier fabric for your headboard. Darker fabrics work very well in a larger master bedroom that already is quite dramatic or romantic. Deep blues, magentas and greens can be very effective for getting this effect.