With Halloween around the corner, I recommend the mildly spooky, totally sweet counting tale, Little Goblins Ten, written by Pamela Jane and illustrated by Jane Manning. All manner of supernatural parents and their children (monsters, mummies, witches, goblins, etc) practice their skills (scaring, moaning, cackling, leaping, etc) before meeting up to Trick or Treat. I especially like how it alternates between mommies and daddies with their respective offspring. Perfect for preschoolers.
You may also enjoy these Halloween picture books that I wrote about a few years ago.