How to decorate my lounge?

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Hi everyone, i have a very big sitting room, its a sitting room with the kitchen at the back converted into extra sitting room and an extension on side for kitchen. I'm thinking of using Sanctuary Oriana Wallpaper - Taupe, from home base, on my window wall and fire place wall, what color would look best to do the rest of the room and do you think it would look better any other way? Thanks