Board Thread:General Mod Discussion/@comment-28383306-20161229011103/@comment-26172435-20161229041854

Simplest way with current mod:

Open mod file with zip app. Extract map.png. Edit map.png in order to create a map with one biome colour of own choice. Save map.png. Put customised map.png with one biome colour in mod file to replace default map.png. Put modified mod jar in mods folder. Create world using customised lotr mod. Voila. Enjoy.