The thing with the mother sauces is their versatility. Each mother sauce can be turned into many other sauces that can go with whatever you are making. One of the best things to do to learn what goes with what is browse different cook books and cooking shows to learn the different flavor profiles and different applications for each type of sauce.
here is a website that gives kind of a loose guide on different applications for the mother sauces.
http://culinaryarts.about.com/od/sau...her-Sauces.htm