Choose tall furniture pieces for the room. The more wall space you can use up between the ceiling and floor, the lower the ceiling will feel.
Hang curtains no higher than the tops of your windows. Hanging curtains close to the ceiling makes the ceiling feel farther away.
Select a center light fixture for the room. This will draw attention to the middle of the ceiling, giving the impression that the ceiling is lower.
Choose flat-finish paint for your ceiling. The lack of reflection will prevent light from bouncing around and making the ceiling seem higher.
Use a rich, saturated color on the ceiling and walls. This will trick the eye, bringing the ceiling into relief and making it look closer.