Modern, Indian, Traditional, and Museum... and one color. That's why it works.
A really subtle, almost masculine, embrace of blue and white.
The classic white framed photo look. A little more feminine than black, and it looks fantastic with grey or brightly colored walls.
If you're framing a variety of knick knacks in varying colors, shapes, or styles, a simple white frame will unify your look. Image from Style Redux.
Using a white frame to bring out a picture - white on white gives this piece a higher profile in the room, and blends well with the graphic, non-cluttered look.
Another good example of "variety" framing - the white brings everything together in a very minimal way.
Images: 1-3, Decor Pad. Image 4, Style Redux. Image 5-6, Melanie Acevedo.