Take a look at Project Skylark, a Houdini tech demo by SideFX that uses procedural tools inside Unreal Engine 5. The project is a vibrant, richly detailed, stylized scene with a fantasy flair, with which you can learn how to craft complex environments using Houdini and UE5.
The project aims to create a scene with procedurals and textures made using Houdini's new Copernicus toolset. The assets include vegetation, plant pots, a birdhouse, and more. With Unreal project files, you can explore the tools that helped build the scenes, including houses, bridges, and foliage.