Colors File Editor
The world map is colored using a set of colors that are read from a file. If none of the supplied color files quite suits your purpose or your tastes, you can edit them or create new color files.
To edit or create a colors file, click the Edit Colors File button which you will find at the bottom of the Display panel on the World View page:
This will launch the Colors File Editor, which will display the colors from the currently selected file. You can edit these colors, select a different file to edit, or create a completely new file.
See Using the Colors File Editor for more details.