Yes, the swine skin can be inverted. In fact, it *is* the inversion of the the regular pattern.

In the pattern generator there is a parameter that controls the width of a bump with respect to the separation between the bumps. To make the swine skin, I made that bump width really small, and then used a negative bump value. Here it is un-inverted.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)