Interestingly enough, Wow, Brewer's Dictionary of phrase & fable (in my hardcopy edition) includes the following phrases but, as you posted, not "green about the gills" (which is probably better known than the other phrases):

Blue about the gills [Down in the mouth; depressed looking]
Pale about the gills [See White below]
Rosy, or red about the gills [Flushed with liquor]
White about the gills [Showing unmistakable signs of fear or terror or sickness]