I'm a recent (late 2010) mechanical engineering graduate who's interested in pursuing a Master's in ID, but I keep running into a slight problem that makes me hesitate: most ID master's programs request if not require a portfolio. Most of my work to date has dealt with structural design and design for manufacturability; there isn't much in the way of aesthetic design in there. I do some casual modeling for fun, but haven't got many samples of that either. How should I approach getting a portfolio together?