Aesop's fables are my own academic speciality, and I never get tired of reading new versions of the fables. Because the traditional fables are usually quite short, that gives you lots of room to re-tell the story in creative new ways. The trick is to find a specific topic or theme that will help you choose three or four stories that will fit together nicely for your project.
Research Tip: In addition to four different Aesop's Fable units here at the UnTextbook, you can find literally thousands of fables at the Aesop's Books website. If you are interested in Greek mythology too, you might enjoy the Aesop's fables that involve the gods and goddesses.