1. Create a ground based on triangles

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First of all you should decide where you want to use this ground style. In the example I choose the area marked by the two brushes shown in the 1. picture. The next step is now to make this area completely out of triangles with different sizes but all with the same height. The fastest way of doing this is to create one triangle and put it in the right position by

using the drag edges function then copy it and put the new brush next to the first one. Repeat this steps till your ground area is covered by triangular brushes.

2. Changing the heights of the edges

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	Now select one of this triangles, bring up the drag verticals function and make on edge of the triangle higher and one lower, like shown in the picture. You must do this either on the camera view or you must change your XY-view to a XZ- or YZ-view in order to do this.
	The next step is to give all edges who meet at the same point the same height. Repeat this steps with all the triangles and you will see soon a good looking result.

3. The final look

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And here you can see how it looks after these easy steps. On the left picture you can see that the height differences between the brushes are so small that you wouldn't realize them if you doesn't know it. So I marked some brushes on the right picture so that you can see that there are really some height differences.

I also put some walls with a rock texture around it in order to show you how it will look in this combination and even the walls are simple rectangle brushes the ground makes them look more realistic.