cellColors→GrayLevel is an option for visualization.
It provides a list of colors, one
for each cell, in the same order as the cells, to be used to fill the
interior of each cell in the visualization.
If there are fewer
cellColors than cells, the remainining cells are displayed using
If cellColor is specified as a number or a list of numbers they are assumed to
should be a standard color
specification such as Hue,