Vallejo Diorama Effects: Ground Texture - Grey Pumice
The placement of your model in a diorama or vignette gives it a reality, a background and a history, an added dimension and a reason for the humidity, the traces of mud, of the dry sand of the desert or the dark earth of the wooded landscapes of central Europe. The range of Diorama Effects offers the modeler everything needed for the reproduction of a terrain, with effects of sandy and dusty roads, or of snow, mud and water, all of which add to the realism of the setting and relate the model to its environment.
Rough Grey Pumice is a heavy paste of resin and natural pumice stone, with a rough grey finish, for surface building and irregular terrain, reliefs and peaks.
This is a large jar of grit suspended in an acrylic medium...so its exactly what the doctor ordered to make custom colored texture paint for bases or whatnot. Need to match a color you've already got? No problem. I tend to smear it on before I prime and when I use a lighter primer color I can just apply a wash of Contrast paint or the Shade wash of my choice.