Despite its name, not at all common, and only the second one I have seen here in eleven years. This was taken in my garden in August 2006. I watched it run over the lawn and climb onto a hosepipe (visible in background) where it changed from green to yellow, it then climbed into a "Bottle Brush" tree where it changed again to olive green and then to brown. Marvellous!
Taken with a P&S camera which I grabbed to get the shot