Words that have an ex in the accented syllable, or start with an esp are lavenderish (Perplex, espionage). Words that end in rene or ique are teal (Serene, Unique). Also, the word Couple is the colour of goldfish. Fluke. Bleak. Little things like that. It's a very slight case of grapheme. I have to say, I'm kind of jealous. I wish I could feel music.