Creepy drapes: Use simple, inexpensive cheesecloth torn into tatters to create that cobweb look around the edges of your deck. Further, to give them an aged look, soak the tatters in tea overnight and then hang when dry.
Owls: Try using pressure treated plywood, cut into the shape of owls and painted black and placing them around the edges of your deck. You can have fun with the kids with this easy DIY project.
Pumpkins and gourds: Of course, what Halloween display would be complete without jack-o-lanterns made from pumpkins? This too can be fun with the kids as they help you – with supervision – carve faces into the pumpkins and place them throughout your deck.
Colored Lights: Create just the right mood inexpensively by hanging black and orange colored lights around your deck. Wrap them securely around the railings for the ultimate effect.
Decorations: Let your imagination run wild here with DIY and store bought cutouts of witches, goblins, skeleton and witches. The best part is that you can either let your little ghouls help you or you can even pick them up from your local party supply or dollar store.
Skull display: Buy several plastic skulls from your local craft store and paint some of them black. Attach them to twine and then hang them around your deck.
Spider Web Wreath: Take an old picture frame and remove the glass from inside then use yarn to create a spider web. Finally, use double-sided tape to hang this to the outside of your deck.
Patio Furniture: Use Halloween themed cushions for chairs and sofas and black and orange cloth for tables.
These are just a few ideas you can use to creep up your deck this Halloween. There are many more on sites like Pinterest and Tumblr. Now is the time to replace some of the festive summer decorations on your deck with an assortment of supernatural beings that will put you in the holiday spirit and will amuse (and frighten) your neighbors.