Sounds like a nice addition and would add some "color" to the game. Definitely should have it be donator-only, and have tiers much like the jihad/player models. I'm not sure how possible this would be, but I'd like to see it.+1.
If doable, as was proposed in previous posts, I'd love to see this as a small addition to the point shop; just colors for your smoke grenades.
+1 , we need this, i think it'd be awesome as an upgrade, if possible, maybe 1500 for coloured grenades
Spoiler: me coming into this thread like +1, saw people discussing it in the shout box and decided to gravedig instead of making a new thread.
+1 let non donators pay points to unlock a color such as Black, and automatically have the default, and let the donators pay points for specific colors and a random option.