Process:
Here are a few prompts to consider, but I have a feeling the best topic will be the one you come up with. When writing,engage your reader with memorable characters—you and the people you’ve met in your life—vivid writing and intriguing conflict.
Lightbulb Moment
Think of an experience when you realized that you suddenly understood an idea, a skill, or a concept you had been struggling with -- it might be something related to a class you took or a skill you were trying to perfect. For instance, you might think about trying to understand how to identify iambic pentameter in a poem or how to complete a Calculus problem. Write a narrative that tells the story of your movement toward understanding. How did you finally come to understand? What changed your perceptions and gave you a new understanding? Your paper should help readers understand how you felt to struggle with the idea or skill and then to understand.
Childhood Event
Choose a vivid time from your childhood -- You might think of the first time that you rode a school bus, of a time when you went to the principal's office, the first A you earned on a test or paper, earning money to buy something that you really wanted, and so on. Narrate the events related to the childhood memory that you've chosen so that your readers will understand why the event was important and memorable.
Achieving a Goal
Think of a time when you achieved a personal goal -- you might have finally completed a marathon or triathlon, or you might have bettered your score on the SATs or another test, or you might have learned how to use a piece of software like Microsoft Word or Excel. Tell your readers about the story of how you met your goal. Be sure that your readers understand why the goal is important to you.
The Good and the Bad
Think about an event in your life that seemed bad but turned out to be good. Maybe you got injured and while you were waiting for your broken leg to heal, you learned how to use a computer. What makes the event change from bad to good may be something that you learned as a result, something that you did differently as a result, or something that happened that wouldn't have occurred otherwise. Tell the story of the event that you experienced and help your readers understand how an event that seemed negative turned out to have valuable consequences.
Personal Rituals
Describe a personal ritual you, your friends, or your family have. Think about the personal steps you always go through when you prepare for an exam. Do you sit at a desk, spread books and notes across your bed, or use the kitchen table? Do you have to have something to drink...soda, water, coffee? There are numerous things we do for which we create our own personal rituals. Choose one event -- writing a paper, preparing for a game, or preparing and having a special family meal. Narrate the events that take place when you complete your ritual so that your readers understand the steps that the ritual includes and why you complete them.
Source: http://myweb.accessus.net/~bradley/narrativeprompts2.html