It's a mess to work with, but I have tried to make my own grass and textured scenery using Homosote dust, with only marginal results. The stuff tended "clump" when I tried painting or coloring it and had a definite, unrealistic, uneven texture. Maybe someone can come up with a better method of coloring the stuff, but, really, there are so many inexpensive grass/foliage/ground cover out there that it's probably not worth the effort.
Having said that, let me know if you have any success doing it yourself!
Paul Fischer
