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I added a simple cell noise generator node for maya software/hardware renderer. Windows 32 bit: python and swig-.dll, should run on any Maya version supporting python. To install put all python files in your plugin directory. Load cellNoise.py, create texture in Hypershade.
Has random, grid and heaxgon mode (0, 1, 2)
If you have cells with jagged edges increase texture size attribute
Min and max value to set color range
If you use this for a project please drop me a line.