The island Nitayo is surrounded by a shield, that makes it harder to get to. Both in the way of travel, but also the decision to travel at all. "Is the island even real?"
It is not impossible, but because of this there are usually more immigrants than tourists. That's a harder decention that requires more thought. This is how Nitayo gained a multitude of cultures, and not just one.
I found a lot of inspiration on this site: http://www.color-wheel-pro.com/color-meaning.html