How to color a small area of terrain?

I am looking for a way to change the color of a small area of terrain. (scripting wise)

For example, if the terrain was brown, and you put grass packs on the ground then that small area will turn green.

I have little to no experience in scripting with terrain, and the wiki does not help too much.

If someone could at least give a small example then that would help a lot!

Thanks!

You technically can't color anything that's not water without editing the color of your terrain tools. Watch that YouTube video to learn how to edit your terrain and color it.

If you really want try you can color it by using glass it might not look good up close but you can try.