You may find this link useful:
You can start by staring at the outline of your own hand, against a white piece of paper. Let your gaze relax and you may begin to see a TV static-like fuzzy aura at first, and then colors will appear faintly. Just keep at it, go at it with a light heart and open mind. Don't try to force a specific color, just take what you get and keep trying. Or get a friend to sit or stand against a neutral backdrop, and do the same thing.
With time and practice the colors and patterns become much more distinct and vivid.