The biggest idea that I latched onto while I was at college was investigating how I felt about my distance from my childhood home.  It's not the most innovating idea ever but it's something that I think about a lot, and was able to spark passion into new art projects.  Living in the world we do now, I also knew that my view was a subjective one.  To get a more rounded view on the subject you'd have to ask a lot of people, so that's what I did.