Check out Dimplex.com, they have many electric fireplace units as well as many fireboxes to choose from and mount on the wall. You can most likely find a local dealer to see in person. We recently had a custom light natural maple credenza made from an Amish company and had a Dimplex firebox installed in it. It needs no special venting because the hot air blows out the front into the room but it does require a separate line due to the heat fan (if you don't use the heat fan, then maybe you won't need the separate line). We have clear glass beads on the bottom of the firebox and it is essentially an LED light show! We actually have a wall mount firebox installed in a piece of furniture. http://dimplex.com/en/fireplaces/wallmounts We never thought we'd use the heat element, but we have used it once or twice and it works great. Honestly, we are so happy with our finished product, decorating our FL condo is still a work in progress, but here is what we have so far. I know its not really what you're looking for, but just an FYI. I wish the pic would show off the flame/lights as they really look, we think they're beautiful.

That table could work.I like it better with the blue Oushak than the red Heriz, though. You're asking for a casual look in a room with fairly ornate furniture, a crystal chandelier, a great big fireplace with a Moroccan mirror, traditional lamps and bookcases down the hall. I'm not sure it's possible without starting over. Besides, I don't find traditional tribal rugs particularly formal.

This is a pretty room with too much Hobby Lobby decor. You've got vases of sticks in display niches. Reminds me of a hotel lobby. Find something you love and want to look at every day to put there. I chose a couple of ethnic artifacts, but it could be art glass, or antique pieces. Here are a couple of rugs that will work better in your room:

If large, rug size should be big enough for front feet of all seating to be resting on it, which doesn’t look possible with layout. Other option is to place a smaller rug in front of couch and to make it feel less awkward, add a coffee table. Suggest taping out different sizes to experiment. Rug colors in other rooms don’t have to be the same but your room‘s shades need to be pulled together, so I’d use a rug similar to one in picture and then add complimentary cushions.