Lee Sounder has released his Voronoi Cathedral kit that will help build nice scenes with intricate architecture.
Introducing the Voronoi Cathedral kit! This series involves Greek architecture merged with Voronoi patterning. Most of the meshes have 3 versions: a 1-sided version, and 2 double-sided versions. One with openings and one with sealed holes. Even though these are high poly, they still have proper edge loops which can be subdivided.
You can find more details on the pack here.