Well, finally I found a "good" photo of the old Zork I poster realized by David Ardito for Infocom. I dunno if there have been colorized posters even for Zork II and III, I never seen 'em on Internet.
Anyway, give a look at the Galleries section to see the pics!

Seems that Amraphael is seriously working hard on the module as his blog brings nearly daily updates!
We had to keep up with all his news and we just updated our gallery for Neverwinter Zork. You can now enjoy 68 screens of this wonderful project.

Seems that can't pass a day that I find a new version of Return to Zork.
This time is the turn of a personal computer that started as a proprietary PC variant intended for the Japanese market for multimedia applications and computer games, but later became more compatible with regular PCs.
I don't think that this version has any relevant addition to the standard PC edition, but here you are a photo of the package:

Probably you know how much I'm in love with Return to Zork, even if I agree on many complains moved to the game.
I recently discovered that this game was also planned to be released on 3DO and Atari Jaguar!
The 3DO version seems arrived just to the form of a "prototype", while of the Jaguar version we have only few references inside Atari Explorer Online. In the magazine issue of January 1994 they say:

"Return to Zork by Activision. The next generation of classic Zork adventures makes its triumphant 64-bit debut! The closest an interactive computer game has ever come to cinematic quality production, Return to Zork fully showcases Jaguar's powerful graphic capabilities by combining a mix of full-motion video live action scenes, and photo realistic animation. This amazing 64-bit adventure is filled with danger, intrigue and low cunning. It's loaded with fascinating puzzles, and a revolutionary interface, an original cast of real Hollywood actors, more than an hour of spoken dialogue and 200 CD-quality musical themes."

That's incredible but I've come into some new informations on an official Zork game that I never heard before!
Seems that in the early 80's, when Mattel was working hard on improving Intellivision's game library, someone tought that an action adventure game inspired to Zork was a good idea.
That game was called Explorer and was planned to have a gameplay very close to Mattel's Advanced Dungeons & Dragons.
Unfortunately, due to the fact that both games could become very similar, Mattel decided to stop the development of Explorer.

Here some screens of Advanced Dungeons & Dragons. Explorer could have looked like this: