Hi senba, Great suggestions above! Yes, use the wallpaper background... but keep it really,really light blue. It will keep the room homogenous and will retain the softness of your paper. That is going to be a very pretty, very fun room when complete.... please post a picture! Elizabeth Cabell, ASID, CID

Photos of the exterior would be helpful.

I have a color like this on the walls of my game room, with espresso colored leather sofa and chair, and blue/teal/lime accents. I used sheers the same color as the background color on your sofa, and the room looks great. However, you could go with black, too, depending on the carpet or flooring.

Instead of the solid grey, you can go for sketches in grey with flashes of mustard/ yellow. Or, look up these links for wallpaper ideas https://goo.gl/images/OrCtY1 https://goo.gl/images/0ZpAmU