believe me, ANYTHING will fly in the writing sample, provided you can at least somewhat plausibly back it up.
one of my prompts talked about art, and my example was going on top of a volcano in hawaii and seeing how beautiful it was, and i BSed some crap about how "this art was not made by mere mortals, but by the winds and imcomprehensible forces greater and more mysterious than the world we lived in". I got an S on the writing section.
Bottom line: you have 30 minutes, come up with the first example (whatever it may be, as long as you can draw some link to it) and BS away my friend.