You ever watch a child create art, or makeup a song or dance?  Their natural artists.  Especially if you encourage them to create.   Have you ever thought about letting them teach you to be creative?  The last couple of mornings my son and I have used a Doodleboard to collaborate on some art.  I drew part of a picture and then he finished it.  It was absolutely fascinating watching his technique as he completed the picture.

My suggestion is to learn creativity from the children in your life.