In an effort to change the way I'm basing my figs, I just ordered some Woodland Scenics Ballast from our friends over at Hobbylinc to use. I ordered both Fine, and Medium bags of their Dark Brown and Iron Ore Ballast. I'm thinking about using the Dark Brown on my WW2 figs, and the Iron or on my Sci-fi figs.
Dark Brown Ballast
Iron Ore Ballast