Also asked, can you cover ceiling tiles?
You can cover each tile individually, or if the surface of the tiles is relatively smooth, you can put the wallpaper over the whole ceiling. If your tiles have lots of cracks, make sure to fill them in beforehand with filler or caulk to get them as smooth as possible.
In this way, can you raise a drop ceiling?
Raising the ceiling is just a matter of rehanging it at a higher height. The maximum height at which you can hang the wall is 4 inches from the main ceiling, or 6 inches if you plan to install a drop-in fluorescent lighting fixture. Use wire snippers to cut the support wires to the new length for the raised ceiling.
The material used for a ceiling should be appropriate for the room's purpose, and there is no shortage of ceiling materials to choose from. Some common choices are drywall, plaster, wood, tile and metal. Popcorn is a common ceiling texture.