If you're still looking for the perfect outdoor Halloween decoration, this garbage-bag ghost is an old favorite. It's easily put together with common household items and the effect is something to behold.
Paint a ghost's face onto the garbage bag using black latex paint.
Place a fan at the bottom of the basket; make sure to leave the cord out.
Place the bag over the basket; you'll want the bag to be held securely, so you might have to use a clip.
Turn the fan on and, as the bag fills with air, you will see a spooky ghost pop out