ANSWER: I’ve got a pretty easy solution for you that will yield great results. As you described, in an open floor plan, with no division, you should paint both areas the same color. My advice would be to pull a color from your countertops, I’m assuming they are possible granite and earth tones or either warm gray tones. Your countertops are a fixed element in the space and can’t go wrong repeating a color that already works. Glidden’s Water Chestnut or Pebble Grey would be great colors to experiment with. Remember to test out colors before painting entire area. With a neutral base, you are free to introduce as much color as you like via rugs, upholstery, artwork, and window treatment.