Here are some sketched examples of the more popular cornice shapes Accumen Shapes has manufactured other than the ones supplied in-stock (examples of in-stock cornice shapes can be viewed in Stock Mouldings):

Accumen Shapes suggest that if the eave is not square to the wall where you are installing the cornice, that you ask us to remove an angled section of the cornice that is going into the corner.  This will give you the ability to roll the cornice as you install it to help alleviate possible gaps.