I think it would be interesting to establish the symbolic meanings of colors as found in a broad range of cultures and religions. I would like to know if the meanings are consistently used within the Bible and across cultures. Some of the meanings are probably near universal (archetypal) since they relate to fundamental elements we all experience, like "red blood" and "green life."
So, I will begin with the obvious use of color in the Bible:
Isaiah 1:18 Come now, and let us reason together, saith the LORD: though your sins be as scarlet, they shall be as white as snow; though they be red like crimson, they shall be as wool. White = Purity, Innocence.
Red = Sin, Guilt
We see a very interesting variation of these associations in Revelation:
Revelation 7:13 And one of the elders answered, saying unto me, What are these which are arrayed in white robes? and whence came they? 14 And I said unto him, Sir, thou knowest. And he said to me, These are they which came out of great tribulation, and have washed their robes, and made them white in the blood [red] of the Lamb. So now the red blood becomes the means by which the red of sin is removed and replaced with the white of purity, which is explicitly called "clean" in Revelation:
Revelation 19:8 And to her was granted that she should be arrayed in fine linen, clean and white: for the fine linen is the righteousness of saints. Thus we have the expanded set:
White = Clean, Pure, Innocent, Righteousness
And "white light" is used in the description of the Transfigured Christ:
Matthew 17:2 And was transfigured before them: and his face did shine as the sun, and his raiment was white as the light. And the Resurrected Christ:
Mark 9:3 And his raiment became shining, exceeding white as snow; so as no fuller on earth can white them.
Revelation 1:13 And in the midst of the seven candlesticks one like unto the Son of man, clothed with a garment down to the foot, and girt about the paps with a golden girdle. 14 His head and his hairs were white like wool, as white as snow; and his eyes were as a flame of fire; 15 And his feet like unto fine brass, as if they burned in a furnace; and his voice as the sound of many waters. And a few other quick observations:
Green = Life
Purple = Royality
Gold (both metal and color?) = Incorruptibility, Extreme Value, Goodness
Well, that should be enough to get the conversation going.