When exercising visualization abilities, change things often. Blow things up or throw them away and make some new ones. Don't get attached to anything, just vaporize it and make something else, even more detailed and interesting. You can add visualization to any module. You can use it particularly when some limitations are apparent in a certain area, or you can just generally work over the area.
Visualization is also excellent for setting a positive direction.
It is a very useful thing to do at the end of a session. Have the client visualize how she would like things to be. For this purpose we want the visualization to be as real and convincing and stable as possible. But again, with as many perceptions as possible, and as much detail as possible. Be aware though, that if it is a future direction, it must be attractive.