I think like this. Pretty much exactly like the girl in the videos except even/odd instead of factors of three. Even numbers tend to be cool colours and odd tends to be warm colours.
When I was younger I thought it might be from those fridge magnets that used to be popular (I also see the letters of the alphabet in colours) but now I'm not so sure because when I learned to play an instrument I found the chord flavours (like minor, major, etc) had colours too.
Because letters have a colour and the chord flavour has a colour, all the chords have a unique colour. For instance the letter C is sky blue for me and minor chords are grey so C minor is a greyish blue colour. The sharps/flats are weird. I think my brain randomly assigned them colours when I was learning. They have their own colour that has no relation to any of the two notes they lie between. F# is light purple but G is orange and F is dark maroon. Bb is golden yellow but A is red and B is blue.
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