Oh I was experimenting with a simple cell diff noise as rock displacement. I usually make a big complex node network to achieve a nice variety of displacement, but this time two cell noise and both of them with two warp shaders,just a bit, both different sizes to create a nice complexity. I also merged them with the subtract mode and got some nice results. Also the textures are usually pretty complex, with little ,and big patches, dark leaks, dots, moss , cracks etc. But this time, a pretty simple noise shader with distort by normal(haven't used this option for a long time because all the small displacement distorts the noise too much.Not this time. As the rocks where pretty big with clear forms, just with 2.3 normal distortion, the texture follows the forms really nicely.)
So a little morning TG experimenting ended up with some nice new, but simple rock formations.