I mentioned the decorations I put up for Halloween outside my house before. The kids like the effect of walking through a spooky forest to get to the front door, and I like that it's cheap and easy. Win win situation.
I literally, gather dead branches from the woods, the gnarlier the better. I prop and tie them around my front entrance. (Free)
Then I begin to cover them with spiderwebs ($1.00 for a bag) and blackbirds ($1.00 or less each). I discovered last year, when the Dollar Tree ran out of large crows early in the season, that I could spray paint random craft store birds black to get the same effect. Actually, I like the variety of shapes and sizes a litte better and I can find them for about 25 cents apiece at any craft store.
I picked up one large vulture from JoAnn's that keeps watch over the front door for $5.00.
What do you do outside for Halloween?