There might be a story of a cursed object. A girl found an old locket in an antique store. After she put it on, she started having nightmares of a shadowy figure. Everywhere she went, she felt a cold presence. She finally threw the locket into a river, and the nightmares stopped.
One: The old house creaked. I turned, and a shadowy figure stared from the corner. Another: Alone in the forest, a whisper said my name. I ran, but it followed in the wind.
One common theme could be the unknown. Many of the stories likely play on the fear of not knowing what is lurking in the shadows or what will happen next. For example, a story might have a character in a strange place and they hear noises but don't know what's making them.