Paint your ceiling with a high-gloss or semi-gloss paint--it will give off a great reflective sheen and make the ceiling go on for days (which makes it seem less claustrophobic).
Low slung or low profile furniture gives your ceiling extra miles because of the open space it creates. Also, try to pick low profile furniture with clean vertical lines.
Delineate the walls from the ceiling by painting the trim a contrasting color. By painting a bold color on the trim, you're forcing the viewer to notice the color of the trim, not the ceiling height.
Stay away from ceiling fans and overhead lighting that draws your eye to the center of a low ceiling. Instead, hang a few wall sconces that keep your eyes flowing throughout the space.
What are your tricks to make your ceiling seem higher?
Related How-To Posts