I am skeptical of the rice experiment - look at the amount of water in the beakers. The positive beaker had more water, the other two dried out and rotted.

To answer the question, no I really don't believe that visualising can make anything happen, not by mystical powers of the universe at least. It would however provide focus towards a goal and a person may then make decisions that would lead to achieving said goal. For example, wanting to own a house probably won't happen just by imagining it but if you are focused towards it, set a good budget and stick to it then it is more likely to happen - not by the visualisation but by the work that went into it.