Biome colors and materials
Choose a matching biome setting for Forest, Tropical, Snow or Autumn. It supplies the terrain materials, water style and decoration references.
Change a material assignment on your editable biome to use a custom look. Duplicate shared Core materials before editing their colors or textures. A material explicitly assigned on the generator takes priority over the biome setting.
Check colors under the lighting and camera used by your game. Ground and grass use separate materials; adjust them together for a coherent palette.