Considerably more detail in this glyph of the tzolkin calendar of 20 days I am making for this mayan alphabet stained glass pattern series to commemorate the 2012 calendar year.  This is supposed to represent the cosmological serpent, but to me it looks like a cross between a crocodile and something more mammalian  (LOL).  Pattern is pretty complicated so needs to be made larger than the simpler patterns for the other characters, otherwise you will go nutz with the small pieces of stained glass to copper foil.