For the majority of dream control, you just have to be creative. To change a scene, you could try anything from opening a portal to imagining your surroundings melting into something else. Don't be afraid to swipe ideas from books or movies too. A well-known way of teleporting is by dream spinning, but personally I've found that that method just wakes me up. It couldn't hurt to give it a try.

There is a flying tutorial in the tutorials section. How I learned to fly was by recreating the feeling of flying from my nonlucid dreams. Of course, if you don't fly in your regular dreams, this won't work. Once again, be creative. There was a thread awhile back about web swinging as a substitute for flying.

There is something to be said about just admiring the dream's realism though.