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Help with the colors of nature?

I'm trying to make a Nature color wheel, showing how opposites cannot exist without each other, and how they compliment each other. Something similar to the Yin-Yang symbol in a way. The Balance of Nature. Do you think I should include life in meaning humans/animals and how they fit into the balance of nature? Well I mainly just want colors of nature that can have opposites/compliments of each other. So far, I have Fire(orange) - Water(blue) Leaves/Grass(green) - ?(red) ?(yellow) - ?(purple) Thanks, all ideas are appreciated.

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1. Hi. This really reminds me of the Wiccan Pentacle: Air (wind, weather), Fire, Earth (dirt, trees, grass, rocks), Water, & Spirit/Energy (life, human souls)...all in a balance. See the attached URLs for inspiration...and, no, it's not "evil"...
2. purple