Made with MCEdit.
I made multiple versions of the structures, the dirt one came first but will be published last, the inside will be designed as a living cell, the higher levels revealing deeper rock and a single large tree in the center, representing a heart of life for the entire cell. I want these structures to have the utmost creative potential. Maybe great space colony storylines will emerge, or last surviving underground cities, microscopic cellular maps etc.

The other structures, Stone Brick, Ice, and Bedrock are designed for alternative angles and material to bring about interesting concepts.
Battle arenas are some ideas I came up with too, feel free to do as you please with them!
I won't force everyone to give me credit, but I would appreciate it if you add them in your maps