HI -- Looks like your almost finished . So the best way I think for a small room like your is to paint the whole room in one color, walls and ceiling . Or you can have the visual ( TV) wall a charcoal color and then have the other walls a tone or so lighter, ceiling too. Look for a fun carpet , which you will need for sound and warmth. Try to make your sound baffels the same color as the ceiling and walls.You can find some great ideas on Houzz for home theaters .

Thanks.. Been searching for color matches for my room... Thanksformthe ideas.. Noted