Haven't looked lately - prolly still humongous murals around , from accurate star locations to objects.
But a black-ish ceiling might have other effects - in daylight and any er future sale. Might want to try this out with a false ceiling first (hmmm illuminated pinholes with color, intensity to suit?)
Or read the short story, The Veldt, author forgotten. Sci-ish fiction, for other ideas..
Cheers,
A.