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Some desert type boulders...two Vue rocks with a positive displacement of vertical and horizontal stretched crystal functions mixed with 'granite' fractals and perturbed by eonite's constant vector cracks as described earlier in the thread. I used voronoi 'angles' instead of 'spikes'. You have to play with the filter a bit. The colors are dark to light color maps driven by the functions and mixed with an image map of rock texture through a color combiner.

I then placed an 'opposite' filter on just the horizontal crystal function giving it a negative displacement. It immediately made for some more interesting movement in the rock's structure.....

Looks great!  I`m curious to see such rocks in a desert scene.

Inverting the function makes a great difference in look, but only if the "valleys" of the function are different from the "hills". A Simple Fractal Node with Perlin Gradient Noise for example won`t look really look different, however as soon as the ridged option is checked, it will look entirely different when inverted. (Not inverted it will have a ridged look, while inverted it will have a billowy look.)

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