theOneRider wrote:
In real life, people using such camo literally take it from the environment they want to blend with. So, I would just do it the same way you do bushes for your tabletop terrain.
Pick out some lichen pieces you like & glue little bits onto the model, probably. Being very careful to use as little glue as possible, of course.
I have a huge sack of model train undergrowth, and just put some bits of those on, without gluing. If you use glue, it sort of "straightens" and looks very unrealistic. This allows you to change between "camo" and "no camo", too.
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"... Telchar wrought it in the deeps of time."
-On Andùril, The Lord of the Rings