If you want to propose a change to an existing structure (like villages), or add something brand new in a current dimension or biome, this is the place.
Caves Update under review
Abandoned Castles in Snow Biomes/Mountains under review
Additions to the Nether under review
Naturally generated structures need redesign under review
Crystal Caves under review
Lakes under review
The Beaver Dam, The Beaver, Stick Block under review