A material can be build from several pattern layers, by adding images. These can add, subtract or mask portions/color to assemble a pattern map or bump map. A pattern (or bump) can be animated by using the Increment Pattern Name option. This lets the pattern name change successively. But this only works correct when one is animating a texture that has but a single layer.It would be nice be able to animate multiple layers. One, two or all layers separately. Or all at once.