I decided I didn't want to think about that so I changed the connotation. Yellow now symbolizes blonde or the synonyms.
For instance, a yellow Volkswagen might have meant a closeted pedophile (What is closeted? There is none.) Now yellow means there is some purity about the subject. That doesn't mean it's smart though. Enter the blonde joke.
Grey had a similar consequence, amending the meaning from, "mixed" to "Pewter". This of course relates to the rock, that does have a grey color to it.