The space is crying out for some colour IMO. What colour are your counters - are they a plain white or is there some veining in them? If there is some veining you might consider pulling a colour from the veining for your backsplash.

But if the counters are white then you can choose pretty much whatever makes your heart sing. What colour are the chairs at your dining table, or the cushions on the couch? Or what is your favourite colour? Do you like the colours in the stained glass windows? Maybe a colour from there?

I think a taupe or sage green colour could be nice because those tones would seem to work well with the colour of the brick in the fireplace. And I'd consider painting the walls as well and installing a backsplash.

Here's a lovely green that might be nice...

herringbone shower tile - Google Search · More Info

You could do a patterned backsplash and then pick up that colour in paint for the walls.

Porcelain Encaustic Tile | Wayfair.ca · More Info

This might be a little fancy but I like the colour and think it would work with the tones in the brick in the fireplace. This is from Tilebar and they have several options in this same colour.

Arabesque Tile for Backsplash & Floors | TileBar.com · More Info

This is maybe a little too bland but the slight variation in colours is nice.

Ceramic Subway Tiles & Small Format Tiles | TileBar.com · More Info

This is a nice green colour as well. The picket shape is very nice. Since you've got high ceilings you could run it like this vertically to emphasize the height. It can also be run vertically.

New Tile Products & Designs | TileBar.com · More Info

I think a good place to start is to order some samples that make your heart sing - Tilebar is great for that - 5 samples for $5.

So many ideas. Thank you! I really like the picket fence tile. Definitely need to add more color.

I wouldn’t introduce another color but work with the island‘s base and the dining chairs. Really like the look below for the kitchen and open concept suitability, which should be considered as well.

Then add complementary/additional shades with cushions in living room, rug, and art on the fireplace, creating a well coordinated open space.

I would tie the two together and think about a brick backsplash. Would add color and tie with the fireplace

I would tie the two together and think about a brick backsplash. Would add color and tie with the fireplace. The also make a thin brick with 1/2 the width

I'd go with color. There's no reason you can't do a nice sleek subway in color. I'd install it in the same pattern as the brick. I wouldn't do anything rustic.

Get some color inspiration from your windows. No need to be meek.

The brick fireplace is very dominant in the space . I’d keep it simple so they don’t fight each other. Lots of opportunity to put color elsewhere.

Go to a tile store and bring home some samples and see how they look in your enviroment. i.e. lighting, cupboards etc. What you think might be the one, is often not the one when you get it in your own place. As suggested, something simple not to clash with fireplace.

I agree, to more or less keep it simple with the backsplash.

Maybe a textured white tile?

I’d put a more colorful piece of art over The FP

New fan/ new light fixture over the living space.

And then add some tasteful accents.
Colored towels.

Candles.

Flowers.

Bowls.

(Look at Mackenzie and childs. Nice stuff)

What about funkier cabinet hardware?