I've thought about doing a carnage costume before... but it would be hard. Done RIGHT though it could be AMAZING!!!
The way I would do it is start with a base of a dark, blood red spandex suit. Very dark red. Then I'd get cold foam latex and mix it so that it's almost the exact color, if not exact, of the suit. Actually put the suit on and have someone "drip" and "fling" the foam latex onto the suit... very minimally at first... then let it cure. (1 to 2 hours of not sitting / moving much... not too bad.)
Do this again with another mixture of foam that is darker red even still... almost black.
And one final time with a mixture that is back to the lighter (but still dark) red.
That could make a very layered looking, organic suit. But, it would still be "static." What it needs is to "move."
The only thing I've thought of to make it "move" is either a) really have movable robotic fibers that are hooked to servos and rotate and flip and stretch and all... OR... b) do it with optical illusions.
You know those Coca-Cola billboards they had years ago that looked like the Coke was pouring from the can? It was simply done with light reflecting elements... sort of like those 3D baseball cards from the 70's that you could scratch and make that "zing, zing" noise on the plastic. Okay... none of that may have made sense... but what you'd need to do is make the layers of the skin (the stuff you did with the foam latex) out of something that was instead clear... like silicone... even fast drying clear silicone caulk. UNDERNEATH that caulking and piping you'd paint lines all over the suit — like a barber pole — then, when people walked around you, the refraction from the silicone would make the stripes underneath it seem to move... making the whole suit look like it was "crawling" around on your body!!!
If it worked it'd be awesome... and I THINK it could work.
That's my idea at least. :cool