Castiel is the appropriate icon because me, my husband, and another couple are going to be the Four Horsemen of the Apocalypse this year to hand out candy! Alas, we will not be the Supernatural versions of said Horsemen, as we don't have a red Mustang, or a wheelchair.
We're going old school. I shall be Death. My yearly costume is an executioner, with an ugly mask that has a black hood built into it, a long gray robe (big enough that I can hunch over and you can't see I'm female), and the most bad-ass axe I could buy from the costume shop. My husband is going to be Pestilance. We have some black and purple robes and a beaked carnivale mask that looks those worn by doctors during the Black Death. A friend of ours will be War. He's a big, strong guy (was a linebacker in high school) who's in ARMA (Association for the Renaissance Martial Arts). So he knows how to kill people with swords, and owns a couple to bring along. His wife, a very small woman, will be Famine. We're still working on her costume, but it will likely involve a scary "starved" mask and ragged clothing. Then we pepper the yard with gravestones, put on the scariest theme music we can find, and try to scare the living bejeebus out of all the boys and girls. It's gonna be awesome!