Well the only idea I currently can contribute is the creation of a
Town/Village/Small City
We all know that everyone can make buildings and that everybody can make huge towns. But who can make the best buildings into the best layout of a town - here's the catch - within a smaller space (such as a 500 block radius circle etc.)
There is a wide range of creativity in the sense that you need to plan out all the essential buildings of a town/village/city and to use up the space efficiently. Building up wouldn't necessarily count too much since the last Project Contest required reaching the new 256 block height limit.
Tell me what you guys think?