American Horror Story creator Ryan Murphy has asked fans to choose a theme for the show’s expansion.In a Twitter poll launched last week, Murphy has given fans the option to vote for ideas the show could explore in future, while remaining vague about the extent to which they will be used.“X-Mas Horror” and “Piggy Man” were removed as options, with the final four being presented yesterday (April 7).It is now between Aliens, Bloody Mary, Sirens and Plague.