I have seen a couple posts asking if they could tint terrain. And the initial response was, no. However, recently, a couple strategies have been devised to tint terrain!
It is quite simple, actually. Here is how to do it.
Materials:
Terrain
Barrier x 1
1.Place down your terrain.
2. Place a barrier on top of the terrain. Remove the border outside and turn off player collision.
3. Turn your opacity to whatever you like. Higher opacities mean brighter colors, lower opacities mean dimmer colors.
4. Change the color of the barrier to whatever you want. You should now have some tinted terrain.