Break up the line of your furniture against the walls by purchasing tall lamps. Tall lamps add visual contrast to the walls without being overwhelmingly bulky. Decorative lampshades can also be used to add color and texture to the walls as well.
Purchase sturdy furniture rather than delicate or spindly furniture. A tall room needs weight, especially if the effect is enhanced with vaulted ceilings, so avoid fragile-looking furniture, which gives the room a shrunken look.
Use the tall walls to hold your lighting by installing wall sconces. Wall sconces illuminate the room while giving the walls a touch of visual variety. Use brass or gold wall sconces for an antique look, or use sleek glass and steel wall sconces for a more modern sensibility.
Fill the blank spaces on your wall with paintings. One large painting in an intricate frame can help cover up a tall wall, but if you do not have a large painting, fill the space with a series of small paintings instead. A cluster of small paintings with a similar color palette creates an irregular, bohemian shape on the wall.
Cover the wall with patterned wallpaper, and add a wallpaper border at around shoulder-height. The patterned wallpaper helps distract the eye from the broad expanse, and a wallpaper border breaks up the visual even further. This works well with a wall that has a molding between it and the vaulted ceiling.