CellularFilter
This filter is similar to the texture filter above but uses a cellular basis function described by Steve Worley (SIGGraph 96).
You can choose between square, hexagonal, triangular, octagon-square or random basis grids and adjust many other parameters. Because of the large number of (fairly obscure) parameters, the customizer for this filter is in the form of an "explorer" allowing you to explore texture space by creating variants of a texture and choosing the best variant, repeating as necessary.
CellularFilter