I came across this post while searching for kindred blogs:

• http://allfight.freehostia.com/tae-kwon-do-meanings-of-the-belt-colors/#comment-190

Our school has several more colors, but they all have a meaning. In fact, based on their meanings it is easy to see why orange is below yellow:

• White - The beginning of light as it crosses the horizon. Signifies the beginning of ones training.
• Orange - The warm glow of that light as it begins to shine. Signifies the small amount of knowledge and skill that can now be shown by the practitioner.
• Yellow - The more powerful and bright rays of light.
• Green - The plants and animals that have grown and fed by the light.
• Blue - The seas and waters that are warmed by said light.
• Purple - The beginning of dusk as the night nears. Followed by a purple belt with a red tip in our style.
• Red - The burning sun as it is setting.  Followed by a red belt with a black tip
• Cho Dan Bo - Half Blackbelt/Half Red belt - Signifies the final transfer to night
• Blackbelt - The endo fo the day and the end of the beginning of ones martial arts journey.