I have just added a few features to improve the variability of generated textures. I included the ability of using two different "layers" of noise each with different configurations, and the option of using "Domain Warping" noise instead of the raw "Fractal Browninan Motion" of Simplex Noise.

Latest release is 1.0.6

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I am still not satisfied with the erosion algorithm. I am looking for something that can come close to wilbur, but that's easier said than done. Anyway, the coding persists.