I loved both of these ideas so I couldn't rlly choose but I love your style, you can really bring the old comic booky feel to life!

You should consider doing a map for the town Derry from Stephan Kings IT, mb an amalgamation of Tim Curry's and Bill Skarsgards

OR

A Goosebumps map that combines the areas from all Goosebumps books, either would be amazing especially for Halloween!