I would like to say that I came it with the following comment, but I'd be lying. It's from the Brahma Kumaris people at 'Inner Space', a spiritual organisation encouraging positive change. And as abstract and esoteric as the quote may appear, it makes a lot of sense to me. All you've got to do is ground it in the real world. Anyway, here it is:
"Be Creative: Every day is an opportunity to be creative - the canvas is your mind, the brushes and colours are your thoughts and feelings, the panorama is your story, the complete picture is a work of art called, 'my life'. Be careful what you put on the canvas of your mind today - it matters. "