With gray elements already in the room I suggest choosing a color theme with gray as one of the colors. I created an app called Color911 which gives you instant help with color. You can create your own palette of colors, pull colors from a photo, or use a color theme as inspiration. I attached a color theme with grays in it to give you colors to use for anything from fabrics to accent colors to dishes. There are other color themes with grays also in the Color911 app, this is only one option, I hope it inspires you!