My ideas for objects
Very large computer screens. 4 ft high / 7 feet high / 12 feet high.
Gun placments, large ones pointed to space or straight forward, and smaller ones characters may stand in or sit in. Auto guns, ones placed on floor others in ceiling or walls.
Complex pipe sections for ceiling and walls. (no sci fi is without those)
Sign sections, free standing from floor or set into walls, (great for adverts like bladerunner, or propaganda for facist games)
Amimated wall and ceiling extraction fans. (great for giving that polluted feel)
Various large, like 7 feet and bigger, tech objects, these are great for filling outdoor areas, or for making rooms with specail machines in them.
Pannels and tech hardware to stick on ceilings and walls.
Computer banks, large free standing ones, like 6 feet high, also smaller size 3 feet high, in various shapes. box, rectangle, hexagon, circle, L shape, T shape, etc.
If we are talking characters, Id say mechs of various sizes, man size and up, they are easier to make as characters as they are not organic, so one can make them quicker and easier, plus they are more fun, as you can have big characters with large weapons, going up in size and the amount of firepower they have, makes for a more interesting game. Also dont have the weapons built in, but have the weapons placed on them, that way one can swap the weapons.
A varient Id like to see is one of them on 4 legs like the Spider Mastermind in Doom, one can go two ways with it, either box type robots like this
http://i.neoseeker.com/p/Games/Xbox/Action/Shooter/the_chronicles_of_riddick_escape_from_butcher_bay_image_GWdl6c3mpxRZGUV.jpg
Or the organic type like this.
http://www.freewebs.com/saibot_theory/enemiez.htm
Escape pod, like in Star Wars (ep 4) and Quake 2.
One with door shut, one with door open, perhaps one bust up and smashed.
