Here's a quick post for reference touching briefly on the relationship between Aztec's and Colour, and what they represented in their society. It's will help me greatly when I reach the more important stages in character development.
Red was connected with blood
Black represented war because black obsidian glass was used as the cutting edge of battle swords, and was also the symbol of religion, with the priests wearing no other colour but black.
Yellow was food because it was the colour of corn, the main food of the Aztec people
Blue meant sacrifice
Green was royal because it was the colour of the quetzal plumes used by the Aztec chieftains