GhibliCraft is exactly what it sounds like: a creative Minecraft server dedicated to re-creating the worlds of Studio Ghibli.
It started several years ago as a one-person project and centered on My Neighbor Totoro and Howl's Moving Castle. Since then, it's expanded to include Spirited Away and Ponyo, and it's continuing to grow.
Newcomers start with two plots in freebuild mode. In Plot World, the main creative area, you get two 64x64 plots, and this is also the area where you can have your projects.
That doesn't mean you can't build whatever you want, because you can. But you can also work toward improving your rank on the server by filling out your plot, building superb creations, filling in homes and buildings, and generally working toward making your building skills even better.
Outside of that is a Large World area, where you get 2 200x200 plots and can do whatever without being judged, along with Town Plot that's exclusively about building houses. Finally, there's a regular world with no restrictions, where plots are obtained through voting, claims, and the other usual methods.
Even if you just planned on building strictly Ghibli-themed creations, there's enough variety in the studio's work to give you nearly endless opportunity. Take a look-see here.