Ha ha - funny, if I saw a goblin with a Santa's hat and bag, I would try to kill him first (to make sure that I get all the goodies that are most certainly in his bag)

(Sorry, Santa-goblin...)
Arminius:
Weeeell, I am concentrating on AD&D critters, so although anything in AD&D (especially standard campaign worlds) is fair game, I am not really interested in doing sci-fi or works based on other preexisting material (especially since one needs a large volume of material to begin making a game of a specific genre - I don't even have enough to do an AD&D game as it is). Since I am doing an AD&D game myself, doing other AD&D critters also helps my own game (two birds with one stone, eh?)...
I would also rather not do "remakes" of old portraits and such (since that feels like "fanart" or copying).
Plus, I just don't watch that much TV or movies, so I am only vaguely familiar with much of what you mentioned above!

(Wasteland... sounds familiar... and vaguely fun (did I play that? I can't even remember...)
That said, there are some AD&D modules that include robots, androids, and other futuristic "creatures" as well - I have been considering adding a few to at some point, actually... (Greyhawk and Blackmoor have included such creatures in the past.) But we will see...
Manikus:
What is a ravenkin? (Maybe it's Ravenloft - I don't have the stats for that one...) I have been thinking of doing ravens soon, though

I guess that one goes somewhere high on the list, then...