"John McMillan" wrote
Lamium Maculatum?
http://www.desert-tropicals.com/Plan...maculatum.html

Or possibly Lamiastrum galeobdolon (Yellow Archangel), which puts out
long runners and is extremely invasive. I heard someone refer to it once
as Lamium Galloping-along which suits it very well.

The variegated version does have a very metallic looking leaf.
http://www.desert-tropicals.com/Plan...leobdolon.html

--
Sue