Painting Ceilings Same Color as Walls?

[Michael Donaldson]

Hello, I'm working on a project right now, and the walls in each of the rooms are painted similar colors (shades of a light grey), however, the ceilings were left an offwhite color. Is this recommended to leave it like this (looks like it was recently painted and the walls are in good condition), or should I paint the ceilings to match the wall colors? Thanks!