Can't see the screenshot at the moment due to annoying site-restrictions at work, BUT, i've seen several cases where DK's (and other classes) have a transmogged Corrupted Ashbringer - but the transmogged item is almost always a WoTLK standard rare quality item.
As far as i'm aware, there was a bug for some time where if you knew someone who obtained a legit CA, you could mog a sword (in most cases it was a troll butcherer) and trade it over to any 2h sword user (counting that they had been in the same party when the item dropped).