In early January, I had a domestic segment on the 757-200 with 16 FC flat beds, which I think would be an aircraft that's normally used for the JFK-LAX/SFO transcons and some short/small TATL routes. I wasn't paying too much attention (late day after a long meeting), but I think the seat covers were darker blue that the vaguely sky blue or almost turquoise that I view as the standard DL interior color. There might also have been a tiny touch of red piping but I was mostly paying attention to that flat bed. It was obviously a brand new interior, fresh and clean with almost a new aircraft smell.