Your tile looks like it might have a bit of a soft gray/olive green in it so I'd go with a light olive green. Here are some color ideas as the page you posted isn't big enough for me to really see the colors.

Hello Orla, I love your Kitchen, you have nice fitting, stunning floor and lots of space! Have you got a splash back already? If not, what are you thinking to add, if you are? With those cabinets some glass panel would look nice and you could pick a colourful one as well. Walls painted in white would look quite flat and boring in your case so I would definitely go for a warm colour or maybe off yellow, that would suit your cabinets colour and the floor too. Good luck with your Project! StJames Design Interiors

Hi. The kitchen looks lovely. As the windows are lower than the units I would avoid tiling or a splashback all the way round the kitchen. Maybe just either go for a decorative tiled splashback behind the hob or use a glass splashback. Keep it simple with clear/light coloured glass or look at other decorative ideas with wallpaper, art etc. Alternatively just tile that oven ŵall about a foot high, handmade metro tiles in a pale olive would look nice. I noticed you like copper so I don't know if this is an idea? It would look great against the white and work with the warm tones in the wood. https://www.houzz.co.uk/photos/louises-kitchen-midcentury-kitchen-adelaide-phvw-vp~1768716 I would also add shelves. Try searching "Kitchen with shelves between windows" for ideas but I might just add 2 shelves either side of the Middle window and pop your herbs on there

A few things I would change from experience...instead of a single and double door I would spend the extra money and put in a bifold corner section...would open up the space so much more. as for the kitchen...completely flip your design...put your breakfast bar closer to the window...make it large and multipurpose with the hob in it and then put your main band of cabinets either left, right or behind? We have recently restructured our existing cabinets to this layout and put in new countertops and it works far better than before!