I think the key, for me, is not to get hung up on originality, but concentrate on saying what I want to say. What is my voice? What's the message that I want to get across? What's the story that I want to tell? Originality comes from you, and only you. So, dig deep. Decide what your main character's goals are, and stay true to those goals. Decide what the tone of your story should be, and stick to that tone. In a sense, I find sometimes that it's best to ignore all the other things that have come before and put my energy into the story itself. Find your voice, and originality will follow.