Mischievous spirits, lacking bodies of their own, have been known to set up house inside scooped-out pumpkins and gourds. You can offer help by arranging these Halloween standbys into animal shapes -- all the better for playful souls to occupy (plus, you'll get pumpkin creatures to adorn the front porch).
First, closely examine pumpkins and gourds at a farm or grocery store. (See Picking Pumpkins for advice on choosing great gourds.) Is there one that's plump like a cat's tummy? Long like an alligator's snout?
Gather parts for the animal you'd like to make, and be creative: Pumpkins don't have to sit with their stems on top, for example. One turned upside down might make a good head; a gourd on its side, a nice nose. Carve features with tools from around your house or from a crafts store, then join the parts with toothpicks. When your animal is ready, set it aglow with white holiday lights.
If you'd like to construct a beast as large as this, consider throwing a pumpkin-carving party where each guest works on a different segment.