Many years ago I started carving up corrugated cardboard as the basis for my 6mm gaming terrain.
For a few years, just about any box that came into my home was attacked with an Xacto knife and cut into odd shapes. Sometimes the shapes were left loose, sometimes they were glued together.
I used these as the mat upon which I set my figures when I spray-painted new tanks and troops. So over time they came to reflect various military greens and dessert tans.
After some time I started flocking some of the pieces too.
This pic shows about the best that technique could deliver for me. Or at least, about the best I managed to achieve.
More recently (if 10+ years can be considered "recent") I have become a student practitioner of Mark Luther's (microbiggie on these fora) approach to game terrain.
Using his approach, my elevation pieces are placed under the game cloth, with pastels used to draw in various surface features such as streams or roads, and to highlight slopes and rough terrain.
On this dessert table, note the hard-paved road versus the dirt roads/tracks, and the ridge on the left side between this gun's position and the village in the distance.
Here is another view of the same table from the opposite side. The ridge is visible to the right in the distance (mostly due to the pastels, as the elevation is not obvious from this angle). Near the top in the distance, to the left of some agricultural fields, there is a small rocky gully. This is an actual cut-out in the elevations, more darkly colored, with some model RR talus applied (and held in place by some fabric shop spray adhesive).
I didn't have to remake any of my cut cardboard elevations. They all work brilliantly under the game cloths.
-Mark
(aka: Mk 1)