Halloween is a great time to think about suspense and scary things. It's also a great time to think about description.
How's that? On Halloween we see and do things that are out of the ordinary, and that gives us a chance to describe things that are out of the ordinary.
What's your costume like? What kind of candy will you bring home? What is the sky like when you step outdoors?
Try writing an over-the-top description of something you see, hear, taste, touch, or smell on Halloween. First write an "ordinary" sentence, then write an over-the-top description. You may not use it in a story, but it's wonderful practice to see how fun description can be.
Here's my description of a black cat.
Ordinary: The cat stood beneath the moon.
Over-the-top: The black, scruffy flea-bitten feline with chewed-off ears, a spiky, mangy tail, dull fur in a tangled mess of knots, four paws like discarded woolly mops, and large golden eyes that glared in the moonlight like a ghostly flashlight, arched its scrawny back beneath the shimmering late-October full moon.
Happy Halloween!