Simple Relaxation Ritual
After you have prepared for the ritual, and created your sacred space, sit behind your alter in the center of the room (if you have an alter) in a chair. If you do not have a chair, then lay down on your back facing the East. Neither legs nor arms should be crossed and your spine should be straight.
Envision a warm, golden light at your feet. It is a ball that glows brightly and encompasses your feet. Then move that ball up your legs, leaving a trail of warmth behind it, and moving slowly over your body. Everywhere it touches relaxes muscles, any tension, and dissolves any stress.
Up your body it goes, until you are completely encompassed in the gold light, and the ball is now hovering over your head. Hold it there, focus on the ball for several minutes. If you begin to tense anywhere just move the ball to that area and allow it to release building pressure.
Remain in this state for as long as you need, but work toward at least five minutes. When are you ready to come out, take a deep breath, and feel the conscious return of your body. Take another breath and bring yourself back into your own head, becoming conscious of the world around you. On the third breath you may open your eyes.
The result should leave you void of any negativity that might have been swarming through you before, leaving you centered and feeling peaceful.
For further information consult Modern Magick by Donald Michael Kraig
Have a look at this hub in regards to Preparing for Ritual
A good way to put this ritual to use is before a Tarot reading: