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Faux boulders: paperback wire lath...bend it beat it to shape, then plaster it with trinity white cement with the stain of your choice mixed in; or: boxes covered with garbage bags, then covered with chicken wire, then covered with about 3 inches of pigmented hypertufa (portland cement, sand, peat moss mix). Gardenweb has a hupertufa forum that is interesting.
Mossy Mushroom - use chicken wire for the shape line with spagnum moss and cover with chia seeds?
Mixing Hypertufa Recipe # 4 - Very good for carving when partially cured 1 Part Portland Cement 1½ Part Peat Moss 1½ Part Vermiculite Recipe #5 - Lighter Weight Mix 1 Part Portland Cement 1½ Part Peat Moss 1½ Part Perlite Recipe #6 - Good Beginner Mix 1 Part Portland Cement 1 Part Peat Moss 1 Part Perlite