SFGate

mpoulsom Do you have 2 chairs and one couch/loveseat? Can't tell from the angle.
But I would probably keeps the chairs, (if you have 2) and get a new couch. Paint the brick fireplace or cover it with a different material, and replace brass. Put one large piece of artwork or mirror above fireplace. You can hang the ones you have now, on a wall in there. An area rug would be nice as well. I would rearrange the furnitiure, but need to know what the pieces are exactly first.
If you like plaid...do a very large patterned plaid in your drapes....you can go with grays or blues or green I think with what you have now. What is your favorite color?

mpoulsom [houzz=
]

mpoulsom If you got an area rug a pattern, then you could just textured solid curtains and raise them from ceiling to floor.

creeser Looking through houzz, I see a lot of furniture this color paired with white walls and some chrome accents. What about white walls and some pale gray, but very substantial fabric for the window treatments? Then put in some chrome or mirrored pieces like the coffee table in the second photo.
[houzz=Beth Rosenfield Design]
[houzz=1190 Royal York]

mpoulsom A whole other look would be to paint your walls dark brown and add teal and khaki colored accents in the room....just brainstorming! This would be a dramatic change however....

Dytecture Here is an example with a modern feel working with the orange sofa.