When you don't know what you're dressed as

For halloween I don’t dress as anything in particular (like green skin, black fairy wings, all black, pink hair with no overarching theme), or something pretty obscure, and I get a lot of “Oh! What are you?” type questions I can answer, but not so many times in one evening. Any advice on how to handle that, without having to change my costume?
 realsocialskills said:
 
Would it work to say: “I’m dressed as a costume!”, and then ask them about their costume? (Eg: “That’s an awesome rainbow tail. Are you Rainbow Dash?” Or “Your sparkly makeup is amazing, how did you do that?”)
 
I’ve found that most people will take the opportunity to talk about themselves if it’s offered.
 
What have y'all found effective in this situation?