Re: FIFA 13 and Ultimate Team Discussion
The boot colours indicate whether a player is in his best position, green being ideal. You can buy cards that change a person's position. The thing next to the boot is whether or not he is comfortable playing in your current formation (you can buy cards to change his ideal formation too). The contract cards renew a player's 'contract' with your ultimate team. Every now and then you'll get a player who doesn't have any games left so that's what those cards are for.
EDIT: I was only 6 minutes late...