Definitely liking the renewable infinity themes and incorporation of CP in #21. The leaves in #22 look really nice, but we are less focused on biomass themes than on direct solar themes. Perhaps a similar idea that incorporates solar prominences ... (arc of fire that occur on the sun)
http://www.google.com/search?hl=en&source=hp&q=solar+prominence&aq=0&aqi=g10&aql=&oq=solar+prom&gs_rfai=