Describe a change.
It can be personal, political, academic, athletic... any sort of change. Any change has a phase before the change began, while the change was taking place, and after the change is complete -- though you don't need to write one sentence on each, and you might want to begin after the change has taken place, and then flash back to the "before."
Every change takes place over a certain amount of time, but you may wish to rush through the change and focus on the results, or you may wish to emphasize the time span by taking the reader through the chronological steps.
Whatever you choose, remember to focus on one thing, rather than a list. Try to SHOW, not TELL, just as you do for all your other assignments.