Forum:KB:Purple Lightsaber Crystal?

Ah yes. The lightsaber crystals. We all know the meaning of the colors. Green stands for the Jedi Consular, the person who strives to be one with the force, and use it. Yellow is for the Sentinel, and Blue for the Defender. Red is a synthetic crystal made for Sith (or a normal crystal after the bleeding process). But then there's one main color left: Purple. This color introduced by Sam Jackson because he wanted to stand out, is meant for Jedi who also use the Dark Side of the Force without turning. But what does this mean? In what way? Do they use things like Force Choke? It doesn't really sound like something any Jedi would do.

I guess there could be examples in comics, but I can't find anything anywhere.