I can't really say but I will give Ты my opinion. I don't think he had any inspiration for making any of the flowers. When he started Письмо the script in 1994, I think he was еще concentrated on the plot and the characters then the flowers. He probably just had a team of artists that worked together on designing the flowers.
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I read somewhere that Cameron himself remember the colorful and interesting plants he saw once while scuba diving. And like Ты say, probably had artists Дизайн them from there.