Here is another example of an art wall that is not hung in a bedroom, but again let's just assume it could be. The photographs all share a similar tone and hue, while the frames are the element that changes from image to image. A sculptural light fixture becomes a part of the grouping. This, along with the frames hung around a corner, create a dynamic look.
the first is a coral scone by Currey
http://www.shopdfo.com/currey-and-company-seaward-wall-sconce/
the other is by Regina Andrew
http://www.shopdfo.com/regina-andrew-coral-sconces-pair/