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For tunnels and retaining walls you can do a lot of your own casting if you have the patience to carve your own stone blocks into the stuff, assuming your walls and tunnel portals won't be poured "concrete". A metal straightedge and a #11 knife blade (pick your knife) are all you need. Hit the plaster while it's set up, but still moderately soft. The edges where you carve your block lines will fracture a bit, giving you a texture of smoothly cut but slightly weathered limestone. It's not hard. All you need is sheet styrene, and you can save a bundle over buying pre-made. <br /> <br />As far as mountain go, there are different types. Folded, fault-block, etc. A short course in geology as it relates to landforms would be handy. For instance, the Rockies and Sierras are fault-block mountains, whereas the Appalachians are folded. All this influences how the rocks are layered in the mountains if you want to go for maximum effect. <br /> <br />As for talus piles (those loose rocks at the bottom of the slope), I just crumbled up bits of nearly-hardened plaster from the bucket, dribbled it at the top of the slope and let if fall where gravity took it, just like the real thing.
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