Many have compared writing a book with giving birth to a child. When you write, you are pouring your self, your style, into a piece of writing. The styles of well known authors are unmistakable. Lisa Scottoline said, in an interview with Borders, “Try to write something that is inside you; you open your heart and readers open theirs.”
Mitch Albom weaves his own anecdotes into his books; he uses a song in every book, kind of his trademark. Your trademark (the term is not being used here in its strict definition) identifies you in a sea of writers, it is your personal mark, your print in the story.
However you decide to leave your mark embeded in the story, eventually, it will reflect your style, and identify you.