So, I assume the topic question was aimed at universe-connected private/rented worlds, and not independent worlds disconnected from the Boundless universe. The latter type is for creative mode and rules there can be completely different.
And here’s James’s description of how they will work (in general). Following that, my answer to the color scheme question is “YES”, as (in my opinion) control over rented worlds colors equals unfair power in hands of players paying for the worlds.
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