If you get a hold of someone's structures/works, and want them to generate, simply place them in the corresponding directories. The base directory 'structures' is located in the Minecraft data directory. You can simply access it by running /#files.
It contains the following subdirectories:
Those directories are searched and loaded when you start the game. To reload, run the Command:reload during the game.
active[]
Structures, Inventory Generators and similar that will be loaded as active. Structures placed here, for example, will appear in world generation.
inactive[]
Structures, Inventory Generators and similar that will be loaded as inactive. Structures placed here, for example, will not appear in world generation.
schematics[]
Schematic files that can be imported using /#schematic. These are not registered, but merely read during the command.