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Hi, This is a beautiful wallpaper choice! Answering your question I wouldn't advice to go with any colour shade from the wallpaper - either grey or green or even gold for the rest of the walls - simply because it will be too obvious. You have beautiful sofa - as I can see from the photos this colour is close to rustic red with an orange hue. What I would choose being you, and what would compliment your whole colour scheme including curtains choice is: https://www.farrow-ball.com/paint-colours/sulking-room-pink which will go very well with your wallpaper, curtains, sofa and carpet. You simply need something which will blend together heavy sofa, curtains and elegant wallpaper. I wouldn't also use the colour similar to the colour of your sofa as it will look too heavy. It has to be something, which is light in weight and is connecting elegantly with your wallpaper choice and connect to sofa at the same time. If you leave sofa not connected to the colour of the wall it will look as you left a separate piece of furniture in the room. With the colour choice I sent you as an example your room will look stylish and warm at the same time. You can then add a warm grey wool blanket (hand crafted ideally) and mixed cushions matched to the colour of curtains, also a bit of grey too.

Your room looks familiar, have you posted before? Nothing wrong with that, I’ve posted several times! You say you want to keep everything light, so a neutral theme would work. Wallpaper can be daunting so I think choosing paint may be a little easier? Pale walls are great and you can add texture with wood and accessories, and a bit of brown or black always lifts a neutral theme. Love Jules’s dark doors - you can see how effective black can be. Apart from the pale neutrals, I think a soft sage green will go lovely in your room. A very calm and relaxing shade. Here’s a couple of pics which are calm and neutral but with dark accessories and another with sage green walls. DULUX SHADES

You have a really dramatic rug, and also the panels set into the fire surround. I think yet another bold pattern for alcove walls would be a bit overpowering - whichever one you went for. I also feel the right hand sofa colour doesn't go with anything, but is a large presence in the room. There would be more coherence if they were both this green colour (or lighter plain) I think I might forget wallpaper for the time ebing, and go for just painted pink walls in the niches alone, to tie in with the rug. You might also consider re-covering the sofa(s) in a plain fabric to match more closely with the pale stone background colour of the rug. If you ever decide to change the rug in future, you could opt for a plain one, and pick a more vibrant wallpaper for the alcoves.