Curtains are actually the coolest thing there is in living spaces. Without them, it feels uninhabitable and naked, I don't like it. But the gray and the furnishings do shock me a bit :O
The topic of color in our house has been discussed here enough already :p It is simply our taste and it will remain so ;) You only see a section of the living space after all.
I think it's so crazy that so few people still put up curtains / drapes ... I think they are what actually make these rather clean rooms nowadays distinguishable from a doctor's office (-: