All civil Boeing Flight Decks were blue up until the 757/ 767. After than they have all been brown.
I assume the 787 will be brown, but confess that is an assumption on my behalf.
I have flown the 737-200 and the 747-100 and 200 in blue, and the 747-400 in brown, and I prefer the brown. Everything at altitude is blue. All the colours get washed out. So the brown is a nice contrast.