its not a room . its a house been built , and the windows im thinking of are cream with a black door. so im trying to match wall & sill colour

Silvermist from Sherwin Williams would look beautiful with your walnut colored furniture. It was a light teal undertone. Here's a bedroom photo with this color. While the furniture color is lighter, yours will provide a stronger contrast.

I would find a neutral tone that is in the stone. It looks like there is a wide range from light creams to darks to suit any taste. Personally, I'm not a fan of cool grays so I would look for warmer tones in the stone. If you plan to leave the oriental rug, I would take it into account when choosing. As an option, you could pull a color out of the rug. It is always good to test color swatches on the wall (a sizable swatch) to see what the paint color does at different times of day. You will also have to make a decision about the sheen of the paint (matte - semi gloss). I find walls with texture (the photo looks like your's might be textured) do better with a matte finish - other than that it becomes personal preference. One nice thing about paint is that it is just paint. If you paint it and don't like it, you can always change it without much effort or cost. Do give a new color a chance to grow on you. Sometimes change is jarring and we make a snap judgement without getting to know the change :)

Refurbishing an old piece is sometimes more fun than restoring it to its original condition. I am thinking a hard wearing fabric in a darker color with some pattern int it would be good to keep the piece looking cleaner longer, because children will be using it.