1. In your opinion, what is creativity?I'm not sure. You know it when you see it, though. It can emerge in many forms — it's not only limited to visual expression — but that happens to be how mine manifests itself (I'm not a creative cook or dresser, for example).
2. Where does it come from?I think we are born with it, and that each of us are creative in some way. Some of us stifle it early on, but it's there. I like what Julia Cameron says: "We are, ourselves, creations... Creativity is God's gift to us. Using our creativity is our gift back to God."
3. How can each of us access that creativity and make the most of it in our lives?I think the most important thing is to accept that being creative is a valuable and worthwhile part of who we are as humans, and to not feel guilty taking the time necessary to explore it!