A Splicer mask from Bioshock... sort of. It's a mix of the cat mask (which is usually black) with some of the details from the rabbit one because I couldn't decide which one to make and also because I got a little confused from looking at too much concept art and then just jumped into the project without much planning (true). But accuracy aside, it's still cool.
It was built up over a cheap plastic cat mask with a modeling paste made of a mix of marble dust and acrylic mush. After several layers were painted on it was sanded as flat as I could get it, then the filigree designs were laid down in hot glue strings which were then painted over and built up with more marble paste. Then I used a pocket knife and some clay tools to sculpt the raised parts with more detail, then more sanding ensued until those bits were smooth. Several bouts of painting and sanding later, and then the blood and grime was added to finish it up.
This was an experiment that I wasn't entirely sure would work, because of the weird materials, but it sure did. The only concern is that it could fracture very easily, so I'm thinking if I make another Splicer mask I could do it this way then cast it in plastic.