General symbolisms and imagery:
Red: Fire (primarily it's destructive aspects), blood(in turn rife with it's own symbolisms), rage, violence, fruity beverages, power(physical or political), poison, danger.
Purple: Respect, wealth, feminity, silk and other expensive cloths.
Blue:Cold. hominess, comfort, relaxation, rest.
Green: Soft grass, forests(whether they constitute a pretty view or a place to get lost and freeze to death.) Raw power, life, chaos, mold, swamps, sewage, untapped potential, opportunity, relaxation, poison/ratiation.
Yellow:Mildew, old documents, cheapness, seediness, Anchient architecture(pyramids and zuggarats, the hanging gardens, etc.)
Nuetrality, mediocricy, electric light, wealth(particularly gold)
Orange: Fire(both good and bad), Warmth, comfort, Vendors (particularly of foodstuffs), noisy public areas, heavy wooden furniture, bathroom tile, luxurious furs and expensive polished furnishings(I used to polish brass doorknobs so people much richer than me could put fingerprints on them. ).
Black: Death, Cold, Night, Darkness, Evil, the Unknown, the secret, the Unnamable, the Forbidden, ash and desolation, and swishy clothes (I love my trenchcoat.)
White:Purity, Intensity, Idealism, cleanliness, blankness, writers block. Life, Starlight, snow, death.
Grey:Nuetrality/genericisim/totalitarianism, gunmetal, Machinery, stone, fortress might, permenance, inexorability. Cities carved frrom living rock , battleships and obelisks.
How's that?