I really like that all of your decorations have a grey theme. I personally think that a light grey of some sort would make the darker frames and comforter "pop". It would be very classy looking, and I really like that. I always have tried to steer clear of colorful rooms, generally because I have a tendency to get tired of the color I picked.
The great thing about painting a very neutral color is that you can do accents, like artwork, flowers, pillows, rugs, lamps, and etc. that add color, yet are easy to replace.
"Horses don’t have hard mouths, they have hard, stiff bodies. The softer you can get the horse through his body, the softer he will be in your hands." Clinton Anderson