Once Health.SE was started we quickly realized that we have the same logo as History.SE. In the answers of that post, many great ideas were brought up. @Tim made a few designs for the great ideas that people came up with. For this post, you can vote for your favorite designs. If you have another design or idea that you'v come up with, feel free to post it.
We will try to get the design with the most votes to be our icon.