I don't know about chaos, but I've associated purple with magic in general for some time.
(This is the original explaination for Lady Confusion having purple eyes - it's indicative of her body having been heavily altered by magic. Her eyes were green before she got the bioenhancement ability, and would be green again if she were ever crazy enough to turn it off.)
I'm not sure where I got this from though, and it may just have been a personal taste issue. After all, I like purple.
-Morgan."Mikuru-chan molested me! I'm... so happy!"
-Haruhi, "The Ecchi of Haruhi Suzumiya"
---(Not really)
(This is the original explaination for Lady Confusion having purple eyes - it's indicative of her body having been heavily altered by magic. Her eyes were green before she got the bioenhancement ability, and would be green again if she were ever crazy enough to turn it off.)
I'm not sure where I got this from though, and it may just have been a personal taste issue. After all, I like purple.
-Morgan."Mikuru-chan molested me! I'm... so happy!"
-Haruhi, "The Ecchi of Haruhi Suzumiya"
---(Not really)