With my tree mod https://github.com/ferreusveritas/DynamicTrees I had to do some uncomfortable things to add my grass blocks and tree foliage into your greener grass color handler. All of your members were private for the feature and I couldn't find an API call for it. I know there's config files for adding blocks for the greener grass feature but that's on the user side. If there was an accessible way to register blocks from other mods It would cut down on using something like reflection to get the job done. Thanks!

Sorry. Just noticed that it's already been requested in issue #336