Since you first posted this, I've been toying with how to reply without getting long and verbose.
"Do you create based on a message or idea you want to share?"
I create based on a message/idea that I want to explore. And I'm never sure, beforehand, either what the question is or what the answer will be. To complicate matters even more, every piece is part of a series that (perhaps) exists only in my mind. (That's why I am so slow!)
"Do you choose a color scheme and go from there? Do you make are based on the media you want to use?"
Color and media choices are my way of setting limitations within which I can explore the idea. And being sensitive to how the use of those choices might change or amplify the idea means that the "question" might change. Even when I've made something for an assignment based on color or a particular technique, later on reflection, I see how it connects with one of the "series of ideas" in my mind.
This is as far as I'm taking this for now. Does this help with your request?
Pat