You have a great opportunity here. I do not recommend placing a tv over a fireplace. Yes, we see it often, but it is not practical for two reasons: 1, the tv has to be placed too high and 2, it is hard on the eyes to be looking at the fireplace light and the tv What I would do is to remove the plaster and re-expose the brick. You could paint it an interesting color or resurface it. Then, I would add a unique mantle.If you have the funds, ideally the threshold should be removed (more contemporary) or resurfaced (more traditional style) The wood store could be a book shelf or display shelf. In the right corner, I would place a comfortable reading chair. The TV I would place on a different wall. Without seeing the entire room, I am not sure where.

I agree with you the pillars are unfortunate. The replacement tiles will stand out no matter how close they come to matching so you're better off making sure they are clearly different so the gray one is better. Putting busy mosaic tiles could look nice but will interrupt the flow between rooms which I'm guessing is your problem with the columns in the first place. You will need to create a dextrous solution to tying into the 2x4 wall on the left side but I think it can be done tastefully- maybe beveling it back once you get past he end of that wall.

Thank you. My husband and I chose the tile (per recommendation at the tile store) and used a professional tiler (per recommendation at the tile store) for the install. It isn't a flip. This is a family home that we purchased and spent a year renovating—not DIY but with all professional hired help and a contractor to oversee the job. This tile person wasn't hired by him, though, as he was happy to use the person that we were told was very good by the tile store…. My heart is sinking. I absolutely hate the idea of retiling the shower as there is matching tile on all walls, including shower. I'm hoping there is some other idea out there that will help. I do personally think the tiler should have informed us if the tiles we supplied to him weren't suited to be mitered…we discussed it even before tiles were purchased and he didn't mention any specifications. I'm just worried now that if we put it on him to fix it, we'll end up with a bigger mess...

Stacked splashbacks always look wonderful!