If you have a room dedicated to photo production, I know a lot of professionals paint the walls (and ceiling!) neutral grey. Control over lighting and color cast is very important and while it is not practical to paint your whole living room grey, if you have a dedicated room just for photography, consider it because you will work in an environment free of artificial color casts. Also for the most optimum setup you probably want to at least be able to block out any outside light, and rely only on artificially created interior lighting- because then it is going to be consistent and not change or depend on the time of day.