I've read that Jack O Lanterns began in the Celtic Countries where candles were put into TURNIPS! Pumpkins are of the New World (the America's).
Personally I greatly dislike the gore and horror now attributed to Halloween and this time of year. I think these things are in the spirit of evil, rather than a wholesome spirituality.
You can celebrate Halloween and the Day of the Dead and All Souls at this time of the year by scrapbooking family photos, working more on your genealogy, and honoring your ancestors who are alive as well as those who wait on the other side.