Green? No. From the American edition of PoA:

A dead, slimy hand slid out from under the cloak[...]Then it raised both its rotting hands -- and lowered its hood. Where there should have been eyes, there was only thin, gray scabbed skin, stretched blankly over empty sockets. But there was a mouth...a gaping, shapeless hole, sucking the air with the sound of a death rattle.

And for the first appearance of a dementor Rowling talks about drowning. I don't know about the skin over the eyes, but the rest of it explicitly points to death.