Thanks, great advice - I have no choice but to focus on gameplay here out. Lack of gameplay really hurt my KS campaign and I don't have much time to do anything but get a functional game in there now, as early access will start within a few months (that said going to try and avoid all the bad things about early access).

Everything is based on math, so its easy to make things non-repeating. Voronoi Diagrams, "Lichtenberg" patterns (for the cracks, can't think of a better word), sin waves, random noise, simplex noise, etc.