I think that you need mostly white, but something in a print that incorporates your colors. Perhaps pillow slips or at least a mostly pea green painting/poster/wall-hanging that also has some brown, perhaps in the frame. You could also do a stencil on the pink wall using the green paint, some white, and some brown. How about a nice tree branch? You can also buy vinyl decals from Etsy or other places--not sure that you could get pea green, but brown and white should be available.

This is a dilemma indeed! Posts in the middle of rooms are always a little difficult. It would be helpful to have pictures of all four walls to suggest the best layout. From what I can understand of your dilemma, I've attached a layout that may work based on your description. It features a defined entry. So when you walk through the front door, you will see a console table with a couple of ottomans stashed beneath. They can come in handy for extra seating. In front of the console are two arm chairs, followed by a modular sectional - they make up your main seating area. To the right of the kitchen door is a TV console. Behind the sofa is a bookcase and to the right is a round table with a couple of chairs for games, paper work or what have you. You don't mention any windows. Is this the case? If so, we'll want to make sure you've got adequate lighting and colors that will work with the limited light. Hope this helps!

With the curves in your couch seat, I'd prefer to see your stripe fabric in throw pillows and a solid used for the couch. I don't like how the stripe fabric cannot not line up from the seat to the banding on the curve, I'd use an aqua on the couch and the gold and stripe for the pillows.

There is contrast between the traditional furniture and the focal point of the floor which pops, draws attention. I would recover the sofas in cream colored soft fabric - suede. I would leave the curtains grey, and put down a large neutral area rug. The edges of the room would show the pattern of the floor. I would color the wall and add texture to it, but not too dark as the room will appear smaller. Add a picture and put a nice plant holder, large vase in the left corner of the room - an oriental-style vase. Or, a cream-stripe fabric on the sofas. You could go soft or bold in this room - depending on your taste.