Some of those colors look fine, but a lot of them are dark. For instance,
CC: the brightest color channel is 0.56! There's no surprise to me that
that's dark. It's also important to keep in mind that a light source only
fully illuminates a sphere's color in one point - where it hits the sphere
head-on. On the other parts of the sphere, it hits the sphere at an angle
and only partially illuminates the sphere there. So overall an object will
be darker than the pigment you give it.

You can try multiplying all of the colors by two to double their brightness:

pigment {color CC * 2}

Or, equivalently (and more simply), increase the brightness of your light
source:

light_source {
    ...
    rgb 2 // double brightness
}

Try experimenting with different amounts of increased light (1.5 for
instance) to see what looks best.

You should use Alain's suggestion about the default{} block to avoid
specifying the same texture over and over, but I wouldn't recommend using
"ambient 1 diffuse 0" unless you're OK with your spheres looking like flat
circles. On the other hand, if brightening your colors may lead to confusion
about which color is which, then that may be your only option. In that case,
you might try a high ambient value without completely removing diffuse, like
ambient .75 diffuse .25 so that the spheres are slightly affected by the
light source.

 - Slime
 [ http://www.slimeland.com/ ]

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