Need building ideas for Minecraft Minigames Server?

I want to build a Minecraft Minigames Server with my friend, but I don't really have any ideas about what the spawn theme should be.

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Japan with pink trees
Egypt with sand and pyramids
Beach with palm trees and skate parks
Cyberpunk
future
middle age
ocean

You can also build a castle as a spawn and pack the individual things into the houses in the castle.