I vote we stick to one system and not make this more complicated than it has to be.  If we start incorporating Norse mythology into the Chinese phases, I think it would muddle the waters to the point that it would just get cumbersome creatively.  I am all for keeping things to one system or the other and I really adore the idea of using Chinese mythology and the five phases.  They are very fascinating and I would enjoy the opportunity to explore some non-Western mythology for once.<br/><br/>Norse has been done to death for me sadly and hence my vote on using the Chinese phases.