What a great assignment. A very interesting topic would be on the idea of revenge. If you think about it, all four works have an element of revenge. Odyssey wants revenge on the suitors, Medea want revenge on Jason, Aeneas wants revenge on Turnus, and Clytemnestra wants revenge on her husband. If you compare and contrast these four episode, it could lead to a great paper. You might want to think about what the similarities and differences are. If you want, you can also ask why these differences exists. That would be very fruitful.