I know there are a lot of drummers here, and I don't know if there are a lot of "note playing" musicians...but for some reason something popped into my mind and I was wondering if anyone else had a similar experience.
From the very beginning when I started learning guitar, back when I was about 13, I've always subconsciously, without ever thinking about it, associated colors with different notes, chords and keys. In my mind, whenever I visualized a chord, it would have a color with it, and it was not an intentional association. For example:
E/Eb - black
F - blue
F# - dark blue
G/G# - dark green, like a forest
A/Ab - yellow
B - red
Bb - pink
C - white
C# - charcoal gray
D/Db - green
Weird, I know...just throwing a random thought out there.