Maybe tanks with Cats logos on them, and everyone has a different Panthers players' head sticking out the top?
I think this would be a good tank to work from for an avatar. Lots of room on the front for a big panthers logo and a smooth line on top to put a big player head on it. I would do it but I am away from my mac for a while and don't want to try it on my netbook. Gizmo has the right idea, nice job man!
I can see the players jersey number going on the side of the turret where the tank # is now.