Hmm, well it depends what you're most comfortable with really.
You could do an imaginative piece from the perspective of a character from The Rugmaker of Mazar-e-Sharif, maybe one of the refugees on the boat with Najaf on their way to Woomera? You could bring in their thoughts with how they think avoiding Afghanistan will rid them of conflict, and yet once they're faced with the detention center at Woomera they realise conflict isn't about the places we are but the people we're surrounded by? Or something like that. However BE CAREFUL
, although imaginative might be the easiest it is no doubt the hardest to pull off. One of my teachers said only 2 out of 100 students at the end of year who attempt a creative/imaginative piece do it well.
I personally always stick to expository as that's what I'm best at. If you chose to do this you could then explore lots of aspects as you can generally talk about anything relevant to the prompt. Try and think of a few different examples from the text. You could also bring in other ideas outside the text in an expository piece - i.e.: think of recent news stories of conflict stemming from people who appeared to live in civil places?
Hope this helps!!