Out of lurk mode with a question....

I'm building a stone wall, 20 feet long x 16 inches high out of
Concrete Block. I'd like to finish the surface with stone exterior
and have located a few local sources, but need some more information
about what to look out for. Any gotcha's or "wish I had done this"
out there.....


Also, is there an artifical stone veneer, possibly made out of
fiberglass, that could be used and
how would one go about locating this ???


Thanking you in advance !!!