These are all examples of "Gradient Noise" which is intended to produce naturally varying types of noise. There is also value noise, white noise (what you are

These are all examples of "Gradient Noise" which is intended to produce naturally varying types of noise. There is also value noise, white noise (what you are thinking of), cellular noise. It is an interesting field! value noise and white noise are computationally easy enough that it probably doesn't make sense to simdify them. probably!