Hi, I created the texture using just some cobblestone picture from the web (can't remember where I got it from but there's plenty royalty free stuff around). I played around with the color and saturation balance to enhance the 'groves' while removing detail. I then made 2 patterns from it, one about twice the size of the other. I first fill with the big sized one and then go over it with the little one with about 50% opacity (also 'washing away' the not-so-seamless edges