Make Gleba terrain clearer

[Barthoze]

TL;DR

Make Gleba differents terrain different enough so it's easier to tell where cliffs and swamps are

What?

The various biomes of Nauvis provides enough contrasts.
Gleba is chokeful of swampy inconstructible terrain, and the lack of contrast between the fertile tiles, the buildable tiles and the swampy ones.
It's hard to see where the cliffs are, too, they are too dark.

Of course there is the possibility to level it out all with landfill and cliff explosives, but it doesn't seem right.

Why?

It would make Gleba easier to understand and navigate from a terrain perspective. The difficulty of this surface should be the logistic chain and freshness handling.