Coloring Walls...

Hello,
I am wondering if anyone knows how to color walls in a photo on photoshop. I want to make it so that the color on the walls also matches the lighting. I tried duplicating the photo as photo2 , and adjusting the hue/saturation of photo1 to match the wallpaper color, and then erasing the walls on photo2. However, it didn't turn out that good. Does anyone know how to do this well, or know of a good tutorial? Thanks.

-Mike

Well, just select the wall out and make a new layer, fill it with the new color, and change the mode to "hue".

As for the lighting... why has the source of light have to change? :p

..but if it does, just draw some shadows, or something... :D