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Randomize by – Using this option, the occlusion can be controlled by a texture map or shader.

Primitives – When this mode is used, each of the items (color or textures) are randomly distributed on each mesh primitive (triangle).
Material name – When this mode is used, the items (color or textures) are randomly applied to the different materials the Multi shader is assigned to.
Objects – When this mode is used, each of the items (color or textures) are randomly distributed on each of the instances (objects).
Material tag index – When this mode is used, each of the items (color or textures)  are are randomly distributed based on the object’s material ID. 
Material ID – When this mode is used, each of the items (color or textures) are randomly distributed based on the material’s Buffer ID.

Object buffer ID – When this mode is used, each of the items (color or textures) are distributed based on the object’s Buffer ID.

Mesh Element – When this mode is used, items (color or textures) are randomly distributed on all mesh elements (in case the mesh consists of multiple elements). 
Polygon – When this mode is used, items (color or textures) are randomly distributed on all mesh faces. (only available in Corona 8 and newer)
Decal – When this mode is used, items (color or textures) are randomly distributed per decal object. (only available in Corona 8 and newer)
Tile ID– When this mode is used, items (color or textures) are randomly distributed on object.
Multiple properties – This option allows you to randomize the result by combining different modes.

Batch load textures – This option allows you to load multiple texture maps at the same time.

Layer count – This value defines the number of elements (layers) that are randomized.

Mix amount – This value controls the blending of all elements (layers). A value of 100% completely blends all element's colors or textures.

Seed – This value creates different randomizations.

Hue random – This value randomizes the Hue for each element (layer).

Saturation random – This value randomizes the Saturation for each element (layer).

Gamma random – This value randomizes the Gamma for each element (layer).

Color – This is the color for each element (layer).

Frequency – This value controls the probability (frequency) of appearance for each element (layer).

Texture – This slot allows you to use a texture map or shader for each element (layer). If a texture map or shader is loaded, it overrides the element's color.