The Thought chakra is located at the crown of the head. It deals with pure cosmic energy and is blocked by earthly attachment. Meditate on what attaches you to this world.
My oh my, this took some time...I wanted to draw more Kataras but my tablet started acting up and wouldn't let me draw a straight line...
Avatar the Last Airbender (c) Bryke
EDIT: Added one or two more Kataras. And her hair IS NOT blond. I tried to make the background sans Aang purple, and I goofed. Too late to fix it now.. :/