Use names(MexPalettes) to return all possible palette names. Current choices are:
Alacena, Atentado, Aurora, Casita1, Casita2, Casita3, Concha, Frida, Huida, Maiz, Naturaleza, Ofrenda,
Revolucion, Ronda, Taurus1, Taurus2,Tierra, Vendedora.
Use mex.brewer to construct palettes.