I was specifically thinking of applied textures, as opposed to postwork.  A dead simple approach would be to take a copy of the original textures, duplicate the layer and delete everything on it except the actual textures themselves.  Then, use an effect such as Inner Glow set to black or dark brown.  This will give you dirty edges to every surface, which is a start.

Coppula eam se non posit acceptera jocularum.

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