It depends on what your goal is. Kopernicus  can scatter static, collidable objects around the surface. Apparently with Science, too. To my knowledge, the only interactable, animated surface features come with the BG DLC and rely on "prefab" assets. You can, however, redistribute and rename these. Look in SquadExpansion/Serenity/Resources/rocsdef.cfg for their definitions. Have some trees on Minmus:  
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