There dozens of examples here of paint choices. The most common is a lower section around 36-42" up of a darker color (like gray), a stripe of rich color (usually red) and then a lighter upper (like white). Full white, while boring, gives the most reflected light and most usable. Some are concerned that it will look to bright/surgery room but I'm not aware of anyone that later went back and painted it darker.
A light gray (or grey) may be ok but is very dependent on how much natural light you have and/or how much lighting you plan to add.