for the new ones I added to rankings, there were elements in each that were good. On ivastres, the orange wave shape was a nice wave (not too ocean wave look), and on the green image, I liked how the n sort of looked like a windmill blade. On jesicastudio's one, now that I see graffiti, it looks too rough (not inspiring to people looking to get healthier), so I don't think we should try that direction anymore. Misjudged that, but the arrows really did seem cool for showing motion.
Last night I did a bunch of google searches to try to get inspired. I came up with "energy waves", "springs", "dandelion petals", and "windmills" and "wind".