sit in a dark room and close your eyes. Make sure you're comfortable, but not to the point of falling asleep. And then... imagine things. Imagine whatever you would like to fantasize about, make everything beautiful and etc etc within your own mind. Notice how if you get into it, the movie in your head plays much better when you're stoned.
Now, if you wanted to, you could turn this movie into poetry, or play a vibe of it on an instrument, or switch on the lights and draw some intense stuff.
Try pretending that your inner eye is a camera in the movie, but a completely uninhibited one. You can move around and find ANY viewpoint imaginable of a scene portrayed within your own mind.