The projects/props we created for our 2005 Haunt:

• The Flying Witches
  A pair of evil witches flying around "Glenda the good witch" tied to a stake - and on fire
   

• Trash-can fog chiller
  A variation on other trash-can based fog chillers I'd seen online
   

• The Haunted Dog House
  Start with a standard dog house, add fog, creepy blinking eyes, and throw some bones around.
  See a short video of the doghouse
   

• Graveyard Entrance
  Using a trellis we weren't using, some cemetery fence we bought, and a graveyard sign we bought