Benjamin Moore colors, like most other brands of paint, come in different gradations of color. Since you know what the color is and we don't, I think you should try paints on the same page of the BM paint deck, only darker. You could try one shade darker and two shades darker. I suggest you do this on poster board and tape them to the wall. Look at them in daylight and at night in lamplight.

Once you determine what color you prefer, I would paint the walls and the ceiling the same color, leaving the mouldings white. With the darker color, they will stand out quite nicely.
Carolyn Albert-Kincl, ASID