  In the article a transition from pattern evolution equation of
reaction-diffusion type to a cellular automaton (CA) is described. The
applicability of CA is demonstrated by generating patterns of complex irregular
structure on a hexagonal and quadratic lattice. With this aim a random initial
field is transformed by a sequence of CA actions into a new pattern. On the
hexagonal lattice this pattern resembles a lizard skin. The properties of CA
are specified by the most simple majority rule that adapts selected cell state
to the most frequent state of cells in its surrounding. The method could be of
interest for manufacturing of textiles as well as for modeling of patterns on
skin of various animals.
