Pick a section of Frankenstein and perform a psychoanalytic reading of Frankenstein. Think in terms of the uncanny, Id, Ego and Superego. Other possible suggestions are doubles, repetition compulsions. The point is not just to demonstrate a Freudian concept in the text, but to elaborate an interpretation of the text (tell us more about what Frankenstein means) through Freuds concepts and the psychoanalytic toolbox.