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I recently wrote a tutorial on generating soft textures and transitional areas that I thought might be useful for some users here. This is something that personally took me a while to get the hang of.
Note that the tutorial uses Quil, a clojure wrapper for Processing. This may make it a little difficult to read if you're not familiar with Clojure (or lisps in general), but hopefully it's not too hard to follow.
Let me know if there are any questions or suggestions for improving the tutorial!