Catagory description text color
 

This is probably another of those simple things to change once you know where to look.

I'm wanting to change the color of the catagory description that's displayed, I'm assuming it's defined in the css but I haven't a clue what it might be called.

I believe that defaults to the overall text color by default. You can add a class to it in subcategories.tpl though if you want to change it.