Procedural seamless slate stone shader

[Art48]

Hi,
I'm currently creating a procedural slate shader. I'm still trying out ways to go, to achieve the kind of stepped/layered look. I need it to be purely procedural because it's gonna be used as a floor shader, covering large areas, and at the same time being usable for closer ups or in foreground. Texture solutions always get tiling and low-res artifacts even when taking 8k+ textures.

I just started playing around with bercon noise and while I think I can get somewhere, I was wondering if you guys know any good or battletested way of echieving the following "Bumpmap"-look in the attached images.

I was also wondering if this is something that could be done via OSL? I am no shader programmer, but do you know resources like www.textures.com but for OSL shaders?

[joconnell]

Vray color2bump is waaaaaaaay nicer than any other option quality wise, I'd go the grant warwick route of having three or four different sizes of bercon map too, each having a nice sized pattern for the different camera distances you'll use and then blended together with the smaller levels getting gradually weaker in contribution.