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You can make them out of foamcore, styrofoam, green stuff, or even cotton balls soaked in superglue. You can also just use regular old rocks from outside. Cork can be a better material if you need to pin a heavy model on top of it, though.
Whatever the material you use, it needs to be painted, even rocks. And as far as paints, there's no ultimate paint for making the best boulders. Boulders are almost never just a single color. They have various striations of rock in them, as well as lichens and various funk across their surface.
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