In which I take my old Horseman's Helm from the bank and transmog it onto my current helm (well current as of when I last copied my warrior to the PTR). The tooltip for my equipped helm indicates that it has been transmogrified. Click for full size image.
In which I do not have a 1H mace to test, so I make a craptastic one with mats on hand from my blacksmith and mail it to my warrior. In the pic you can see the woeful Volcanic Hammer which has been moggied into the Tankard O' Terror! Click for full size image.
Now to come up with the perfect armor set for this look =)