I don't think you cold get anything worthwhile really. They are to precise and detailed to be reproduced so quickly and with such a clumsy tool as a laser pointer. It would be very difficult to create straight or accurately curved lines with it.

As others have said. I think the only way to get it to be exact a new kind of technology would be needed so we could store these images in a digital form. Reminds me of the movie Paprika (anime) where they have a machine that allows you to store your dreams and also allows a "dream therapist"to enter your dreams and interact with it.

They already have technology that can allow brainwaves to be translated into digital information with electrodes being placed in the brain. One man who had a disease that caused him to lose all control of his body had one placed in his brain that allowed him to move a mouse pointer around a screen and direct things. Hopefully one day we can somehow learnt o translate impulses into images.