Curtains in the same color as the walls?
Q
Nice wall color but maybe too dark?
This is bad! The junction between the wall and ceiling is too harsh.
Corniche between ceiling and wall. Would it be too much considering the ceiling already has a molding.
Dark grey as an accent works for a chimney or feature somewhere
Dark accent may be nice on certain walls. Maybe the chimney or the inverse like in this picture.
Wall to ceiling contrast is good.
Curtains in the same color as the walls?
Q