Feature walls aren't just for living rooms and dining rooms, you can create vignettes of interest all over the house and especially in the master bedroom.
Your headboard provides the ideal opportunity to really make an impact in this space; consider oversized designs with deep cushioning, or an overhead canopy in draping fabric for a classically lavish or romantic look.
Above 2 via Coolayan
Mirrors hung in multiples also make great wall features, arrange them over a dressing area for extra oomph!
If modern is more your style, try adding interest to your headboard wall by hanging a contemporary painting above your bed, apply an abstract graphic design, or use a vinyl wall sticker for a quick but effective solution.
Via XM Studio Rustic wood paneling forms a cozy backdrop, and looks great teamed with moody black and white photography, as shown above, in a fabulous utilitarian scheme.
In recent years, master bedrooms have evolved to also include entertainment stations with wall mounted TVs, DVD players and games consoles, and these items provide another opportunity to make a large statement in your décor; inject color and cohesion by adding a glossy wall panel behind the gadget menagerie.