I really dislike how the mossy one looks in that image, but it is mainly due to the moss not blending into the stone. I'm assuming something like the Hue and Saturation tool was use to make them, with the mossy parts unselected. I like the idea, but the mossy parts need to be fixed. They could also stand to use a bit more grey in them, if they were dyed they would still have more of the original stone color showing.
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