GeckoJosh, you are quite correct. The point I was getting at is that if one can further reduce the possibilities in an ID thread, then I believe one should do so.
Tahniandshae, I agree that it does look like a straight carpet. I have never seen a hatchling cross but I did have several photos sent to me of adult natural intergrades and they were very carpet like. I think it gets down to how close the neighbours are, if one keeps snakes and how close to natural bushland the house is, as to which is the more likely origins and type.
Blue