one idea I have is Fern Gully but the fairies are mushrooms...because I read a study about how some mycelium and certain plants clear pollution and it would be cool to see that in fantasy form...
another idea I have is a bit darker and deals with someone wanting to get proof (photo or video) of different cryptids in Appalachia but running into Men in Black (btw they aren't as fun as the MiB movies if you read the original stories), aliens abducting people, hunters looking for weird trophies, etc.