Love this photo wall - did this in my upstairs hall. We call it the family wall because it is photos of our extended families. I did a mix of photo frame styles but stuck to silver and black as colors. (With the amount of repins this thing is getting, I should say that this picture was the inspiration for the photo wall I created. This is not my wall)
Color accents can be created purely through art and furnishings, particularly textiles. However, from my perspective, this less architectural approach is a bit weaker and more difficult to coordinate. I would prefer using accents in all elements.