Goblins, ghosts, and ghouls -- oh my! It's officially October, which means the green light is on for Halloween decorating. If you're looking for an affordable and low-key way to let little trick-or-treaters know you've got candy, a gaggle of ghosts is a safe bet. This outdoor Halloween decor isn't pricey or complicated. Plus, once night falls, these ghosts can light up for extra creepiness.