Hypertufa

Hypertufa is a simulated stone made from cement, peat moss (or sawdust), and water. They are permanent because of the cement in them and they are light weight because you substitute peat moss or sawdust for sand or rocks. Add vermiculite or perlite to make them even lighter.

Hypertufa bricks can be painted or carved. People make pots, planters, stepping stones, grots, castings, statues, columns, and many more decorative things out of hypertufa.

One favorite thing to do seems to be to take a styrofoam ice chest and coat the outside with hypertufa and use it as a planter. It looks very much like a heavy, carved, antique, limestone, horse trough from England. The stone those troughs were made from was called tufastone - hence the name.

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I found this on the internet long ago - don't know who to attribute it to.