I can't stand when there's a trip mine grenade in front of me and I don't know who's it is. Sure you can shoot it, which I often do in case it's the enemy's. But wouldn't it be great if it flashed a different color for teammates? I vote for green.
EDIT: Apparently the grenade shines white instead of red when it's friendly. I can't tell... Vote up if you think it should still flash green!
-
Every tool is there to communicate as a team. The community cried for in game chat yet I have never heard a voice on the other end. So be cautious of grenades or find a team. This would make things easier than they should be for pvp.