21 deviants said Scary comp - present the animatronics in the scariest way possible. E.g. extremely spooky, something that'll even give adults nightmares, maybe blood, etc. Basically, try to be Scott Cawthon.
20 deviants said 'Style' comp - draw the animatronics in YOUR OWN style! Should focus on their personality, appearance, or other details that make them stand out.
19 deviants said Alternate FNAF Universe - what if the animatronics were actually gender-bended, anthros, what if Mike was an animatronic and the animatronics are not?
10 deviants said something based off of the seventh night presets (Ladies Night, Golden Freddy, ect.)
9 deviants said Crossover (video games, movies, etc.)
8 deviants said Origins - your own take on how things happened
7 deviants said 'Style' comp - draw the animatronics in a certain art style! (e.g. manga, anime, Tim Burton, art noveau, etc.)
6 deviants said Party themed
3 deviants said Puns (FNAF-related)
3 deviants said 4-koma (so it's a comic strip with 4 panels)