Alex from the VRayGuide site posts a tutorial looking at creating more interesting textures by the use of VrayDirt maps in V-Ray. Check out the post and tutorial for Creating photorealistic Looking Materials by Using V-Ray Dirt Maps here.
Alex writes: VRayDirt is one of my favorite maps in VRay, I just love the extra AO that this map can produce! Learn to have full control over your vray textures by giving them photorealistic look. This map will do the trick for you with easy few clicks you change completely the way your scene looks.
