Thankfully I live in the country and don't have to juggle the social discomforts of trick or treat. Even when I did live in the city I made it a point not to be home that night…go out to eat, see a movie, anything not to risk having to turn little kids away who know nothing about the origins of the trappings of Halloween, or nowadays probably little or nothing about the Christian faith either. Anyway, that's how I avoid it.
That said if someone does not entirely share my discomfort with the holiday…why not a treat with a cross on it…maybe a marzipan cookie or a mini cupcake. If you want add a tiny business card sized life of a St. to go along with it…hey for the west it's All Saint's Eve…why not share a Saint and a treat. That said I would be cautious about putting icons on the cards as they are likely to be trashed by most customers.
For myself, I just plan to be out of pocket for a couple of hours…might go see some of the ninth graders play basketball.