Maybe this one?

Take a look at the largest size on the dropdown menu -- a stretched canvas one with no frame .....

Here is a link that might be useful: art.com -- large artwork

If the desk is staying where you have it in youir picture, I would find something for over that and treat it as a separate area. Then I would choose something HUGE and abstract-because that's me :)- for the seating area.

Here is a link to an artist who does landscapes that are close to abstract or color field in feeling. We have a small painting of his which I love, but his large pieces are fantastic. There is at least one on this page that is 6 feet by 5 feet, but he has some that are even bigger. I think something similar would be amazing on your wall, but of course, that is only my opinion!

Here is a link that might be useful: large paintings

Neat room!

I think the room could support a modern wallpaper mural like the nyx from trove.

Someone here talked about this manufacturer a few months ago and I am smitten.

Here is a link that might be useful: trove

Gallerydirect.com has huge canvases fairly inexpensive--especially if you buy when they are having 50% off sale.

I saw this on houzz.com the other day and saved the site. I liked that you could use your own photos to create some large art.
http://allpopart.com/

I love that popart site!

srg215- I don't have any suggestions but just wanted to say how awesome the fireplace/bookcase wall is!!

Gah, help me understand what I'm seeing.

There's a wall mount tv near a fireplace with a tile surround/mantle (the top picture), and there's another wall mount tv near another fireplace that looks like plain drywall (the bottom picture). Are those two areas in the same room? How are they oriented to each other?

Initially I'm agreeing with crn247. I would put something with height like a plant or large floor lamp at the rear corner of the sectional (where it meets the wall) and use that as a visual stop for that area. Then decorate before that as one space, and after it (desk area) as another space -- but making sure that the two areas compliment each other.

Is that mirror (or thing that looks like a mirror) to the right of the tv in the bottom picture something that's built in, or something that moves? What is it? (e.g. is it a mirror you had hoped to hang...?)

avesmor - they are the same tv and fireplace. The last picture was from before the fireplace tile was done.

My first thought is to echo the calm, harmonious colors in the beautiful piece across the way because of all the action around the fireplace, maybe even a bit more so.

I also thought perhaps defining a seating and a desk area might work well, but then it seemed as if the opposite side might read as one unified stretch--?

In that case, I wonder if echoing the boxes in the bookcases might work? Perhaps four subtle, related pieces mounted at the same height across the wall, starting over/left of the armchair and ending over the desk?

I would use the same black frame and find a picture of a landscape with white and red trees. I would use the same white mat also. I love the room!

If this were my room I would consider paneling (or fake panels, super easy) on that wall. You could make the panels any size you like. I would put some sort of long table on that wall with art above it and maybe a couple of ottomans on the side of the table to elongate further. Something like this.

A brown, grey, and white color palette is a little unusual. I think the three colors can look nice together, but I'd like to see them shown together via artwork, fabric, etc. The fifth picture down on Caminnc's thread, looks like it could have been the inspiration for the entire room. If there is any way to get that piece onto one of your walls, I think it would go a long way toward pulling the room together.