Things to consider when composing a bookmark:

• design
  The bookmark must fit comfortably in a book, so its size and shape are important. The art work, color and font should complement the content.
• content
  Why is your content suited to a bookmark? How are you interesting the reader?
• dummy
  Your self-edited version should be a mock-up or dummy (that is, a trial effort in terms of shape and design for your final publication).

Examples
    "Taken away by the Pages"  by Freddi
    "The Devourer" by Brooke
    I Know What You Did Last Summer
    Ten Little Indians by Katie
    My Night in the Swamp by Megan