Now for some non-concrete thoughts.
I dislike Halloween. I especially hate yard decorations. For one thing, do you know how eerie a fluttering ghost or witch can be when you’re driving by in the dark, early in the morning, barely awake, trying to get to the hospital?
For another, I think covering your house in Halloween images is downright foolish. Witches, for instance, are not benign jokes. Sure, many self-titled witches today probably can’t accomplish much of anything. However, that doesn’t mean the concept isn’t real. In the Bible, for example, the witch of Endor summoned the spirit of the dead prophet Samuel, who accurately foretold King Saul’s death in battle. In general, the idea of trafficking with Satan should not produce warm fuzzy holiday thoughts. (And even if you want to talk about different kinds of magic, in the end any real magic, in this world, comes down to the same thing: rebelling against God’s providence and trying to control Nature and events through your own power.)
Ghosts? Only in modern American cotton-candy thinking are ghosts friendly. I don’t believe they actually exist (as opposed to witches, who are at least a theoretical/historical possibility); “it is given unto men once to die, and after that the Judgment.” But if they did, they have been portrayed from time memorial as unhappy spirits, either trying to escape from an unpleasant afterlife, or with some vengeful business to accomplish. There’s a reason haunted houses have been viewed with terror. Why would you try to bring that atmosphere to the house you live in?
Jack’o'lanterns: designed to scare evil spirits away from the house. Also not originally funny.
Spider-webs: yes, personally there’s nothing I detest more than a real live spider, no matter how small. So my view may be skewed. But are any of you really fans of spiders in the house? So why drape giant ones over the outside of the house?
In short, people who celebrate Halloween, and especially who decorate enthusiastically for it, are demonstrating a breathtaking lack of imagination. For a Christian perspective on the reality of evil and the supernatural, and its potential for devastating intrusions into the everyday, try Charles Williams’ Descent Into Hell or All Hallows’ Eve, which could be described (by extreme oversimplification) as a ghost story and a zombie story, respectively. For a (slightly) more upbeat approach, still involving a powerful and evil wizard, read War in Heaven, which is my favorite of his seven supernatural novels. (For those of you now questioning my literary taste, these are nothing like the current pulp vampire toxins flooding the market. Charles Williams was once a dabbler in black magic, who then converted to Christianity, and was a member of the Inklings, along with C.S. Lewis and J.R.R. Tolkien. So he knew what he was talking about, and he wrote as only an Englishman trained to write Latin verse from childhood can write English.)