Thinking about this a little longer, I would like to offer some practical distinctions between the various means of tying the Running Zeppelin or Zeppelin Noose.
First, a bit of nomenclature to distinguish the three methods of tying this knot:
Alpha - tying by slipping the loop over the standing end
Beta - tying the way illustrated in the image attached to the first post above
Gamma - Roo's way of tying, using a bight
As has been noted before, the Alpha method would require access to the standing end.
Gamma would require having on hand the end of whatever object you'd want to slip the noose around.
Beta, by contrast, requires neither. It could be tied even around a ring, which obviously has no ends. Beta is, effectively, a method of hitching the Zeppelin Loop to its own standing part, while (potentially) hitching the resulting noose around the object the noose is to be tied around. Gamma, on the other hand, could be slipped around that object only after it's tied.
I wonder if we could coin some standard terminology for these distinctions, which also hold for other knots. Or perhaps there are already standard terms for them that I am not aware of. Does anyone here know of such terms?