In my mod, I change the terrain type each time an alien is killed on it.
Each time the terrain gets a little worse, so it goes from grass, till eventually red desert.
My current order is:
Terrain
In Factorio 0.15, the final red deset tile kinda looked like blood, but in 0.16 it's not as red.I was hoping to create a new final terrain type that looked pretty barren with possibly some small alien skulls or something.
The below was the closest I cold find as a sample.

Thanks.