Prometheus' use of unused ideas from Alien, Aliens etc...

Thought this was pretty interesting. Last night I was watching [i]Superior Firepower:The Making of Aliens[/i]. There's a part where Henriksen is talking about the character development he did for the film. He said that he and Cameron weren't quite sure how to introduce his character in a way that would stand out. He said he and Cameron were on the phone and Cameron said "...maybe the thumming of the ship and everyone else is in stasis and maybe Bishop is just wandering endlessly through the ship..." I'm not sure but I would think Ridley knew about this. I was thinking that's kinda messed up if he did. Then I thought about how Fox has all the rights and holds all copyrights on pre-production art and early drafts of scripts and everything. They obviously gave Scott carte blanche with the material in the same way they gave Sega or whoever carte blanche to create the new Colonial Marines game. I'm sure it was known that it was an idea from Aliens and that Scott wasn't sneaking around trying to use it without giving credit. Then there's the possibility that they came up with it with no knowledge of it being an idea tossed around for Aliens. I love the fact that they used ideas from Alien that they weren't able to use or achieve back in the day. What have you came across or noticed that was an homage to or an unused idea from the Alien franchise or any film for that matter? Beyond the obvious of course like the use of the derelict, space jockey design and all that. One is what would have been the egg silo in Alien. Any others?