Do you want skins for grenades?

They would add something to the game... though it wouldn't be something that brings players back to the game.
Unlike gun skins, when you're looking at someone from a distance or playing with them, you'll really only be the only person to see it... unless you pick up their grenades and things when they die, which is relatively unlikely.

Would be a pointless addition to the game, where they should be sticking their time into improving VAC rather.