So we've talked about how editing terrains in DS works, but we haven't talked about how to add materials to them. Well, Sitni Sati gave you the ability to do that with the DS terrain material.
This material is really advanced because it allows you to specify the min and max values of what color you have assigned to the object. So for example, say you wanted to have a mountain with snow on the peaks. You can specify to only affect certain areas on the mountain by working with its slopes and elevation. Also, you can sort of mix it together or have a falloff effect so the edges aren't extremely visible.

   With little effort, this landscape
  scene was made in less than 20min

Above are images I made pretty quickly utilizing a lot of
the Terra System's options and then went  a step further
and added materials to it to give it that desert feel.

Finally, the last thing I want to talk about is the DS noise map. This can add tremendous extra detail. You have seven different noise types which all do different types of displacement. Then you can add this into different places in your DS terrain material.
For example, when you add it into your slope parameters, it will break up the solid edge line so it looks a bit more realistic than just a hard line.