I've got a pond/creek in the backyard, I intend to put a nice waterfall
back there, but those darned rocks are heavy, and I always have to move
them 3 or 4 times before they are right.

Anybody ever made a 'water feature' with styrofoam? I'm thinking I can
get a huge chunk and carve it into a pleasing shape then coat it with
something, but what is that something?

Any ideas, I really don't want a store-bought/prefab look.

Thanks