Finishing Basement: Black Ceiling
You may want to try running a simple band of trim (just a finished wood 1x2) around the perimeter of the room just below the bottom of joist elevation. I've seen this done and it really helps to define the color transition from the light walls to the darker ceiling and give it a more finished appearance.
This Apartment's Palette Is Full Of Greys, Black, And Wood
A sliding wood door defines this modern bathroom, while hidden lighting has been used in the floor, creating a soft glow and lighting up the mostly dark room. The white tiles help to reflect the light throughout the space.