"Gray is a cool, neutral, and balanced color. The color gray is an emotionless, moody color that is typically associated with meanings of dull, dirty, and dingy, as well as formal, conservative, and sophisticated. The color gray is a timeless and practical color that is often associated with loss or depression."
I have read over many years that gray in a room increases moodiness and depression. Styles come and go but I feel this one is a mistake in home decorating. My opinion, but one that is shared with color/emotion researchers.