Halloween spider decoration super easy and inexpensive= crepe paper and balloon. I added a smaller balloon (same type- just less air in it) for a head. next year I'm gonna add a red X made from crepe paper on it's butt.
The Chicka Chicka Boom Boom Tree is made from a carpet roll (free from local carpet store) tube wrapped in brown butcher paper, stuck in a Christmas tree stand. The top is an umbrella covered with green leaves.