Love the bit about crystals, Kyla! I had a chat with Phee about this recently, about how a Sensitive's 'colour' really determines how they think, what their lightsabers look like, and why the three Jedi orders (or those taught by ex-Jedi) have the colours that they do.
In fact, consider your lovely descriptions of the colours 'stolen'! (Apart from the fact that yellow represents something darker; our Sentinel Order is drawn from the most ruthless and amoral of the 'dark' Jedi...)
Added to that, we decided that purple is the 'special snowflake' colour. Revan and Mace Windu had this colour, and if you 'think in purple' you're either a super-confident person destined for greatness, or an arrogant grandstander who thinks he's better than everyone else. Sometimes it's hard to tell the difference.
White is favoured by non-Jedi, with connotations of balance, zen or purity.
I suppose there are other colours like pink or orange. We haven't decided if 'darksabers' are A Thing yet, but if they are, I'm betting the Sith would give their supplies of black eyeshadow and Bullet For My Valentine CDs to get hold of one!
Edited by Maelora