Shapeways is a young business and there are a lot of things that we still have to figure out. On the subject of copyright/IP we are however very clear in our legal texts/content policy (which is very humanly readable so you don't have to hire a lawyer to understand them) as well as in Joris's recent post.
Having said that I do really like your tentacle models, (being a Lucasarts point&click junky myself). The colours are also absolutely vibrant.
Now I don't know about this from first hand, but I do know that the guys who build scummVM (the open source, freely available SCUMM engine that will play old point&click games) also have such troubles.
From what I understand however, they tend to track down the original developers of the games instead of contacting Lucasarts. Which I assume is about as useful as putting a note in a bottle and throwing it in the ocean, but who who knows? San Francisco is a coastal city.
But anyway, games in those days didn't get developed by armies of developers and artists but just a hand full of compassionate people, people who do have the contacts to get those permissions and who are more likely to be cooperative then the company that owns the rights.
It will be a long shot either way, but I would really like to see you get permission so I can order a pair for myself
Until then I will just have to make do with the game itself, *starts up day of the tentacle*