When designing a room the ceiling is often a over looked area. If you do decide to be creative and step out of the design box here are a few guidelines.
1. If you select a bright color for the ceiling keep in mind that it reflects that color back down on you . . . so . . . it would be best not to do this when doing a bathroom or bedroom where you might be putting on make-up or picking your clothes for the day.
2. When putting a chandelier above your bed you might want to look for one with a diffuser on the bottom. That way you don't have to lay in bed and look at light bulbs brightly shining while you are trying to relax.
Hope this helps when thinking about the ceiling in the room you are giving a face lift.