Quote: "It's those 'little things' which we often overlook. The drip of water from the roof, the small scraps of dust/newspaper floating around the air, and making each wall/floor unique and filling each room with small and unique entities."
You know, decals actually haven't changed much in many of those games, the only difference is spawning vs predefined. In that case, simple conditional statments and custom decals should do the same effects, though you'd actually need to honeycombe and intraweave decals to get a suitable "3d dusty" effect.
(Course, if FPSC is like what it was, that could be a pain in the neck).
But in any game, it's actually not the static objects that people like, but the small interactable ones that they're really wowed by. HL1 sold because it had soda machines that dispensed SODA! You want to maximize player interactions with your environment and viseversa. So if you're going to spend the time to interweave decals to make a decent fog effect, instead choose to have a triggered flood effect and deal with the repercussions of it not making any sense later :p.
*really doesn't know why he's here*
Its not who you are or what you've done... its WHY you did it and how far you are willing to go.
If you fear speaking for yourself, make use the words of others while discovering your own voice.