Simply put, one collects images from photographs, magazines, newspapers, or other sources that reflect a goal or series of goals. One then collages these together, and displays the board where it is visually prominent. Seeing the board subconsciously reinforces one's commitment to those goals. If done in conjunction with a ritual, or even a more informal spiritual setting, once could charge it with power to further reinforce its energy.
The above example is from Google Images; searching the term "vision board" brings up many others. They can be made for the whole year, for a single goal, for many goals - it's really up to the individual. One of the women at SIPA last night says that she does mini, weekly vision boards in her planner - I know I don't have the time to do that regularly, but it sounds like a fun (and useful!) idea.
