This is art. As long as you include fandom, interpret the theme however you wish. You can even come up with your own color palette you feel represents flora or look up others at Colour Lovers (or Deviant Art or Pantone or a non-pay site like Colour Lovers). Just please be sure to credit your sources in your post!

These inspiration posts are just to get those creative juices flowing unless we say that you must use the stuff posted (i.e., in abyss_valkyrie's book cover theme where you were to use only the posted book covers for inspiration). Hope that helps!

Are you asking to sign up? I ask because I misconstrued another comment as a signup, and it wasn't one.