Not sure if this mod is still receiving support since the last update was a year ago but would be nice to have a config in the json to add more than one color to custom berries, Im making a mod that have plenty of colorful gems and ingots and this mod would fit perfectly if that feature is added, if it already exists please send me an example of how to do it.
Thanks for making such great mod.

Such a feature doesn't currently exist. The only berry that's more than a single color is the essence berry, and it's hardcoded as a special case. It seems like it wouldn't be too hard though. I'll try to add it in a week or two.