More thoughts for you. Love the fireplace and the mantel. The inserts above the mantel could be removed and tiffany glass inserted or some type stained glass since the sunshine seems to be shining on the panel area. If you find a back wall, a light placed behind the glass could create a wonderful focal point. Or a photo light above would be good is you have a translucent background. Painting brick is problematic, but maybe a cement stainer/finisher could color with a different color of choice to enhance the stained glass colors.