So, do you still think that using the intellectual property that belongs to someone else is not a problem? Do you think that if you are creating a "tribute" or "fan project" that you will be left alone?
The guys over at The Silver Lining had been working for EIGHT years on a fan-made game using the old Sierra I.P., "King's Quest". They even got the tentative "OK" from the old owner of the I.P., Vivendi. Now that Activision owns it, they have been told to shut-down:
"Recently, however, ownership of the Sierra IP changed hands and became
the property of Activision. After talks and negotiations in the last
few months between ourselves and Activision, they have reached the
decision that they are not interested in granting a non-commercial
license to The Silver Lining, and have asked that we cease production and take down all related materials on our website."
Eight years eh? These look like a bunch of smart people. I wonder how many games of their own they could have created in that time (maybe they did create some games, who knows?)
Anyway, again, we say: use your own stuff.