If you want to use your aura as a tool to check your own or someone else's state of health and mind and do something about it, I recommend reading Serge Kahili King's new book "Changing Reality."

To help increase your aura, he recommends: 1) deep, slow breathing, 2) imagine your aura expanding, and 3) imagine a ball of light sitting on top of your head and filling you with energy.  Do all three at once for the greatest effect.

I realized when doing this how similar this exercise is to the "Medicine Buddha" meditation I learned long ago.  In that meditation, you would imagine light coming from the hands of the Buddha, Quan Yin, Jesus Christ or the powerful deity of your choice, breathe in the healing light and then breathe it out through your body out into the world. In essence, I believe it is essentially the same exercise, but giving the ball of light above your head more power, by having the light come from a powerful source.
 
 
Piko-piko breathing is used in the ancient Hawaiian healing tradition of Huna – used by Carol, one of the characters in "The Chakra Diaries" to heal her sacral chakra.  Try it... Imagine breathing in from the sky above and breathing out through your navel. Make these deep breaths, moving your belly up and down.You’ll be moving healing energy through the body, oxygenating your brain, unblocking tension and increasing your personal power.