Has anyone catalogued the Grunt color variations?

[Grunt War Chief]

In Halo 4 not only do the grunts have different armor to differentiate the ranks but they also happen to have different color within each ranks as well.

 

Do we have any info on all the different colors from each armor and what do each color means?

 

I also think i might have a problem with the lighting in the game playing tricks on me and making see colors that arent really there. For example, the storm Grunt i think only has orange and purple but i think i saw blue ones and im beginning to think that he blue ones might be purple ones under different lighting.

[Dragonzzilla]

In Halo 4, colors seem to be less relevant than they were in the original trilogy. Covenant come in multiple colors now but they differences are completely cosmetic. I've seen orange Grunt Imperials, red Jackals and even green Elite Officers. The armor differences is all that matters for the Storm.