I need to make my bathroom ceiling seem higher than it is. Do I paint it white or light gray (same color of the walls)? Also half the bottom of the walls to the floor is done in yellow 6″ tiles
Go with the light gray to make the ceiling seem higher than it is as the walls will flow better into the ceiling if it is the same color, with the white, people are more aware of the ceiling as it stands out more.
In order to create the illusion of height I would recommend painting the ceiling white. This will increase the reflection of light and open up the space. If possible, I would also eliminate the grey painted walls and change these to white also. This will draw the eye upwards, making your ceiling seem higher. Removing the grey will leave you with a yellow and white colour palette that you can decorate and coordinate with, creating a bright and sunny room.