Dark blue to go with Egyptian Cotton

[lionsleepstonight]

Just painted bedroom in Egyptian Cotton, which I love as a colour but the room now looks a little blah. I love the dark paint feature wall idea but struggling to find a suitable navy. Any ideas?

Crown Midnight Navy?

I've paired it with F&B Hague Blue in my bedroom and really like the combination. I could take a picture for you although it might be better in natural light.

Dulux Breton Blue is gorgeous.

Here it is - DP's handiwork so slightly wobbly lines but we don't have a straight wall in our house.