Bright room, help

live in your room don't strip it... do as rives says and get the first reflection point on the damn parallel walls and lay a carpet with underlay for the first floor reflection at the minimum.

Leave the pictures on the walls as they will absorb some sound and more importantly diffuse sound. Leather sofa will absorb similar to cloth.

if the vaulted ceilings are high enough and the look is acceptable get some fibre board and fly them off the ceiling to absorb and diffuse.

if you do all of this the room will go from "Live" to more neutral and allow for more relaxed listening. Enjoy the music!

Don't do anything to your room until you've found the right
position for your speakers(?).

If you can get them well out into the room, and angled toward your listening postion, you might not need any damping material. See the Cardas website for room placement
guidelines.

Acousticsfirst.com is very competitive and may be some help, Good luck.

Hang some nice decorative rugs on the wall. Kana813 offers good advice. Here's another great site on positioning

http://www.audiophysic.de/produkte/aufstellung/aufstellung_e.html

Also try a rug on the floor, (with non-slip backing of course). Rugs on the front and back walls will tame brightness and on the side walls will improve imaging.

Your source is probably the culprit more than the room. It would help to know what your gear is.