I think it would be a good idea if when you got a crucible/strike medal you could get a corresponding emblem with the image in your medal. Possibly, there could be a system where lower level red and white medals would have to be awarded multiple times to unlock the emblem of that medal, whereas you would only need one gold and black medal to earn an emblem. This could be a good incentive to play crucible on top of bounties and post match loot, also who else would love to show off how much ass they can kick in pvp?