Ok the whole white/dark magic stuff should be free to chose and change at any time. But I'm talking about details. 
example from  <img src="/ubbthreads/images/graemlins/div.gif" alt="" /> :
divine one: lightning spell => blue lightning
DK: lightning spell => red lightning
same magic spell, diffrent implementation.  <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />