Where can I find LEGO-like building plans for Minecraft? [closed]

Youtube is your friend. It's the best place to find out how to make structures, or at least get inspiration.

Here is an example of a house building tutorial.

Otherwise there is minedraft for 2D schematics drawings. I don't know if there is a library of minedraft schematics though.

Above is an example of a schematic.

MCEdit has a feature to save/load .schematic files. If you look around the internets, you should be able to find plenty of people sharing what they have made in this format. This, however requires MCEdit...

The other format I've seen things shared in is as saved worlds, which simply requires minecraft. Again, search forums for them, there's lots out there.