The rainbow, incidentally, is often associated with chaos, particularly Limbo, and there is a CN Temple of the Rainbow in Cthul-Ra that sells psychedelic substances.
(This is lifted from the log of a game session; the stuff in italics is from the DM.)
The Rainbow stories lack plot and suspense but have great imagery. They are very vivid scenes and have lots of neat color usage. The ones in the red section are coherent but things get worse as you go up the spectrum. One common theme is that all of the red ones are pretty violent (at least they seem to be). Interestingly, none of them is overtly violent (about killing etc). Some discuss things like sunsets, there is one on a solar eclipse (about eating a red sun) and some about blood, in a very abstract way.
[Me, quoting the whilg: "Red is for the blood."]
When G reads them, he feels a strange throbbing within him. They seem to
strike a deep chord somewhere.
The poem about the solar eclipse seems to etch itself into your mind. After
reading the book, you can't remember the words, but the scene is very clear
in your mind:
You picture yourself sitting in a green glade, somewhere by a pond or a
lake. There are small lizards scampering by your feet, playing. In the sky
there is a full, red sun (not the usual one you think). In fact the sun
looks bigger (like a red giant). The surroundings are also faintly alien.
The lizards have an extra pair of legs (3 pairs rather than 2) and the front
pair seems not to be used for locomotion. The plants are also strange,
having no leaves, but only twiglike thorns. Everything has a deep reddish
hue from the lighting. In the sky the sun is being swallowed by a large
black moon. And all around you there are strange screams, that you cannot
really hear, but only sense in your mind. It's like nowhere you've been ---
not even the abyss dreamspace.
So ... just something to remember for the future maybe.
Silvana, when she read that piece, had a much more mundane interpretation.
She thought that it was about some red flowers being eaten by a cow.
[Me: Seems like an alternate prime (or another planet, which may amount to the same thing).]
Right...
It's noplace we've been yet, in any case.