Hmmmmm. This reminds me of an expressive drawing class i had in school. One of the students was the Aerospace Engineering teacher at the university and a personal friend to the drawing intsructor. Over the course of the semester i saw him really struggle with the various assignments we had. Now, let me tell you that this class was by far one of the best art classes I had ever taken. My teacher, who is the head of the pictorial department, is a wealth of knowledge, technique, and experience and I am greatful for what I learned in this class. Unfortunately, all the interesting, challenging assignments in the world couldnt get him to think outside the box. He just couldnt let go and let the creativity take over and it showed. Long story short. Nope, you can't teach creativity. I used to think you could but after that class, I really saw how it is something you either have or you don't. Some people are really good at numbers, or learning languages and others are creative.
There is a certain amount of change that can be done in brain dominance though. I remember when I first started teaching I took a brain dominance test that showed my brain worked in the left of center. This meant that I was slightly left brain dominant and an analytical thinker. Several years later I took a similar test, and it showed me off the scale to the right. I don't know how much credence to put in these tests being and educator, but interesting fun anyway.