What don’t you like about the tiles? If it is the colour, then get them painted in white or a colour that you do like. The pattern adds interest. What are the measurements of the laundry/bath room? Is the dark line a door to the laundry from kitchen? Why did you spend so much money on the kitchen without looking at the overall improvement of your entire home at the same time?

Just went on to realestate for photos of the laundry space. The photos show a good space doing a lot of necessary things. You could put a beautiful curtain hanging from the ceiling the full length of the room. Do you require the two troughs, this could be reduced to one to allow the curtain to go to window wall. This is the first inexpensive option. The more expensive option is to rearrange the entire room and it’s components, and build a new wall and create a walkway to outside. Oh and I see the door to laundry is actually at the dining room end, which the plan does not show.

Example of suggestion

I wouldn’t love the tiles either. That’s a lot of lines. The cheapest fix would be to try a grey grout pen that matches the tile colour. It may reduce the busyness.

Or you could paint them white as suggested.

There is a lot you can do with laundry. Under the window replace existing cabinets putting a bench right along wall over the washer, remover the washing machine taps and plumbing it to new sink. Integrate the sink as undermount in new bench. The second thing is this is a bathroom too. If budget allows I would redo bathroom as it’s own room accessed from entry to bedroom 5. With kitchen I am not a fan of the tile colour and would look at removing the tiles above sill height on sunroom wall and just painting that area. Add some colour with kettle toaster etc. removing the tiles will simplify the view removing some distraction. If you hadn’t already renovated kitchen I wonder if it was not better in the wip corner allowing the window to be an entry to sunroom. Relocate sink?

Simpler option maintaining shower just relocating vanity to enclose bathroom. Also change to laundry try and conceal washer behind door. You will bed a deeper cabinet but well worth it and move sink to the right so it is less on show.

Oops ignore bed 5 entry in the last image