[Semi-OT] Making alien terrain

G'day guys,

Derek and I are just about to embark on a major terrain building phase
and 
I was wondering if anyone had tried making terrain out of "spray foam"?
We 
got the off cuts from a friend who was insulating her guinea pig hutch
and 
they looked a lot like rock formations.

I've also painted up the blister packaging off kids toys before and
we're 
all set to do some styrofoam and artist's board carving. Have we
forgotten 
any other cheap material??

What have others used?

Thanks

Beth

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Elizabeth Fulton
c/o CSIRO Division of Marine Research
GPO Box 1538
HOBART
TASMANIA 7001
AUSTRALIA
Phone (03) 6232 5018 International +61 3 6232 5018
Fax 03 6232 5053 International +61 3 6232 5053

email: beth.fulton@marine.csiro.au