I'm a psychologist and life coach. I employ techniques from positive (strengths orientated) psychology and coaching to help people reach peak performance in life.
Metathoughts are higher level (more conscious, enlightened) thoughts. They are also often thoughts about thoughts. A person can use them to create a better reality for themselves.
I had an idea of a tree (similar to the uploaded one) inside or growing out of someones head. The tree symbolising the (evolving or growing) thoughts. I like the fact that the uploaded tree also looks fiery or ethereal, like thoughts.
This is just an idea and not a requirement. If you have your own creative ideas, please let me see them! :D