Let me in on that secret color, John. I could use it on my layout. I found a light sandy color paint that I apply over the foam substrate before applying foliage. The funny thing is that everyone accuses my scenery base of being white, even after it's painted. But, many folks don't really understand how light the color of the soil can be in eastern North Carolina. Truthfully, it can almost become sun-bleached to white in areas. If I understand correctly, the sandhills (my layout's locale) are literally ancient sand dunes left from when the ocean was higher or the land was lower.
DFF