Style my new white kitchen please - blank canvas

[Charlieandlola]

I have just had a white kitchen/diner/utility room installed in 3 very dark, north facing rooms and the walls bashed to make one large room.

I have painted the walls white too as a short term measure. White quartz worktops and engineered oak flooring.

I need inspiration please for splashback, curtains/blinds for a set of french doors, a patio door and two wide windows- plus upholstery/cushions for a banquette seating area ( currently being built).
I think I would like to paint one wall as a feature in a block colour. I don't want wallpaper or intricate designs etc. I don't want orange or lime or bright pink, I was thinking navy or teal ? I was thinking of this range as it gives me all the options I need, or is it twee to have "matchy matchy"?
www.johnlewis.com/john-lewis-partners-helmsley-lined-pencil-pleat-curtains/p3659050

Nice fabric but don't use it everywhere.
Window treatments in it, fine. Using it for cushions and seating upholstery might be too much, but use the colours from it in plain (or plain textured) fabrics for the other soft furnishings.
The accent wall can be a contrast, just use tiny bits of this contrast elsewhere too.