Introducing some sort of playercards would not be a bad idea in BF2, now that you mention.
Or maybe some high-tier appearances for characters, with an "either-or" system - you could buy them early for a high amount of credits, but you could also earn it by reaching a certain level.
DICE TeamThinking out of the box from my own self here, there are definitely ideas that you can do.
Like add a gold/carbon black coating on a gun or add small items/decals on your armour or something that makes you stand out, but we have to keep in mind that its licence product so it means it not everything up to DICE.
/Atic
