The fireplace wall is an homage to the great artist Sonia Delaunay, who decorated a car in this pattern in in the showcased her own work in this very space. (Christian Liaigre Paris vintage showroom designed with antiques dealer Florence Lopez
There's some interesting color combos going on in this pic. The muted green walls and the dark and glossy green door and the more lime green chair. Kind of fun to see so many variants of a single color.
I think green would be my pop of color.just a thought. Something about gray and green dramatic sheer green curtains - January 2013 Color of the Month - Emerald Green - Pantone Inspired Color Design Decor Trends and Ideas - Update Dallas