Dereck,

nice definitions.

I'll add that

white is innocence and inexperience

gold /yellow can be the colour of the earth where the seed is planted.

blue is also the sky towards which our green plant is growing.
red also signifies danger, both to the opponent and the student, who is now entering a vital time in training and may try to reach to far.

black is knowledge, impervious to fear and maturity.

The more colors your school has, the more your instructor gets paid for;)

Trained at a few different TKD dojangs while traveling and more than one had the camouflage belt thing, must be good for hunting or Ninja's

I remember an old man once telling me the following...

Belt colours and what do they represent:

WHITE: Winter - A Snow encrusted barren landscape where growth is difficult to see.
The new practicioner must develop a will power to survive this frustrating, brief period.

YELLOW: Spring - Although the snow has thawed and growth becomes more visible, the Sun is not yet at it's zenith.
Practice every move to the best of your ability and do not rush to learn the next technique.
You have to build a strong foundation, if you want it to last.

GREEN: Summer - The Sun is at it's heighest and all things begin to flourish.
As your confidence in your abilities grows, be careful that your ego does not.

BLUE: Autumn - As the leaves fall from the trees, their branches can be see to claw towards the sky in their hunger for more.
Understand the strengths and weaknesses in all techniques and when to apply them.

RED: The Sun - You begin to soar above plant life like a bird as you begin to feel and not think your techniques.
Stay humble and keep reinforcing your foundations, lest you crash to the earth like Iccarus.

BLACK: The Void - Close your eyes. It's dark isn't it? You cannot see yourself or any one else. You are all alone.. Don't cry.
Look inwards, refine your skills, deepen your understanding, retain humility.

We have only 2 additional belts, err. well 3 for WTF, but I have seen several different colors in tournaments, like white with yellow strips, yellow with green strips, and I have seen the camo belt, which I think is totaly retarted...

White
Yellow
Orange
Orange w/green strip
green
purple
brown
red...

I gotta ask was it Jhoon Rhee, Jigaro Kano, or the guy who came up with Shotokan (I keep forgettting his name for some strange reason) who came up with the modern belt system. And I wonder what he would think about these "spiritual" meanings about a piece of cloth that use to hold your pants up, before spandex that is :P

Just food for thought.