Cardboard Tube Craft: Make a Colorful Ghoul Family! But monsters are great any time of year, so this works year round! From Amanda Formaro of Crafts by Amanda Try with pvc pipe and light up for the yard.
Mini Spinning Ghosts and Free Pattern Cardboard Spinning Ghosts with free Patterns--These are so easy and cheap! If you have cardstock on hand, they're free! (I've included a printable for tiny ghosts.) These are perfect for class parties!