If we think of it at all it's just white but once in a while I get someone asking about painting it a different colour to their walls or continuing the wall colour on. If your ceilings are low and you leave them white it can seem even lower. It can be more interesting to add a brighter colour up there to compliment your walls. You can use a lighter version of the existing wall colour or even the same colour for continuity, to extend the sight line.
You can even bring the ceiling colour down onto the walls by about a foot if you have really high ceilings to lower them slightly ,to make it more cosy and less cavernous. The possibilities are endless as well as the colours! Check out these examples and maybe try something in your home.
Painting always brightens and freshens up your space so go ahead get a jump on Spring and paint your ceilings, be adventurous. I'm going to give it a try too!