I might not get it done until next year, but I was thinking of making a gory disembodied eyeball. I have a huge inflatable eyeball that could be made into a mask if cut up and glued over a frame, but what to make the body with? I'd want it to look like a mess of red veins and tentacles, so I was thinking of using some sort of foam or resin over a shirt and pants.
I've never undertaken such a project...my usual costumes are basically jokes (a cardboard zombie, Inky the ghost from pac-man, and much worse).
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http://www.bogleech.com
Red and black, and slimy green.