What soft furnishings do you have. You could pic out one or two colours as an accent colour and use that as your Base for the curtains. I currently have cream hessian walls and have a duck egg blue and chocolate curtains. I'm currently making matching Oxford cushion covers for the settees . If you can't find what your looking for ready made buy the fabric and have bespoke curtains made for you.

Hi Option 1 As suggested by Cornerstone above. This way the TV will be visible from dining too Option 2 Move TV to the corner of the entrance wall, next to the window, placed at 45 degree angle. The L shaped sofa can then go to the diagonally opposite corner. The wall can be a see through book shelf/crockery shelf. This is better as the visitors have some inviting empty space as soon as they walk in instead of a sofa. Option 3 TV in current position, but instead of the TV being mounted on wall, perhaps have an open shelf (like below)

Teal is a very trendy colour, but having it on all four walls may be an overkill in the kitchen, especially with that dramatic chevron dado tile. I hope at least the 4th wall is white! The cabinets have to be white too

white and browns - forever in style