Stigma wrote on 08/20/09 at 13:53:44:
I've even heard this recommended as a training technique: Listen to a certain style or artist while studying a particular opening, and you will more easily remember the theory if you think about the music!
That's exactly how my wife prepares for her exams.

Never tried it myself, but she says it helps.
Back to the topic, I have a few colour associations, for various reasons:
- The Dutch is orange, for the reason MNb says.
- The Norwegian and the Danish are red because of the flags.
- The KID is green, probably because my first KID book had a green cover. Could also be because green is my favourite colour, and I like to face the KID.
- The Meran is White, because I score very well with White in that opening.
- The Black Knight's Tango is, well, Black.
Those are the ones that I can come up with right now.