I wouldn't quite categorize this phenomenon as a coincidence, but several unrelated customers came in during a short period requesting similar designs: white-on-white. A white mat and white frame. Sure, I've sold this design several times in the past, usually on color photography, but never so frequently and on such diverse art.
Below is this clean look on oversize Massimo Vitali photographs from from an interior design site, Coastal Style Living.
I spotted these design images (above) while researching Vitali photos that came through our shop (below), framed in a similar way. Note that Vitali photos are generally beach shots from above with deliberate washed-out color. Beautiful.
This look is very modern and used often in conceptual photo exhibits. I always warn clients hanging this type of design in their homes that white-on-white looks best on a contrasting color wall, and not nearly as well on a white or off-white wall.
Below are some recent white-on-white designs on items that are not color photography.
contemporary artist print
original pencil in distressed white frame with coordinating fillet