Hi! So I'm not much help with paint color, but wanted to share two things that we did which you might consider: first, we got a high-heat black spraypaint (Rustoleum from Home Depot) and painted the fireplace face plate (the brass part) black, which instantly updated our fireplaces for about $10; second, I did not care for our red brick fireplace, and hand-painted it to look like a different color of brick. Without priming, I hand painted each brick Benjamin Moore Eagle Rock, then sponged on a lighter grey (Willow Creek) and a darker grey (Ironhorse, I think). Later, I decided it needed some brown, so I sponged on a bit of watered down brown paint (can't remember the color). I took care not to get paint on the mortar. The whole project took about a day. It came out great and I get tons of complements. If you are at all hesitant about getting the "painted brick" look when you do it all in one color, I would consider tying this method first. 99% of people would not know that the brick had been painted. If you don't like the way it turns out, you can always go back to your original plan!

So you like purple? Please buy soft lavender curtains, or some with purple printed flowers, I've had dark purple curtains in my old house (3meter high ceilings) and it looks really dark when they're closed. Add a purple sofa or lots of purple accents to keep it calm and friendly. You could paint the window wall a deep eggplant (not the other walls because of light) with creamy curtains.

Is there already a chimney in place? The space looks very small, so consider a thin stone veneer and a small, electric fireplace for the look without the need for major construction. See Houzz photos under "electric fireplace" for ideas of style, incorporating storage.

White for other walls.