Things You'll Need
Instructions
Connect your Xbox 360 to the Internet. Turn on your console. Use the controller to sign into the profile that you want to edit. Go to "My Xbox" and press the "A" button on the controller to select "Edit Gamer Profile."
Select "Download Gamer Pictures" with the "A" button. Wait for the Xbox Live Marketplace to open and search for "Call of Duty 4." Press the "A" button to select "Download" on the picture you wish to use to save it to your Xbox 360.
Return to the "Edit Gamer Profile" menu. Select "Gamer Picture" and scroll to find and select "Change Personal Picture." Select the "Call of Duty 4" picture under the image section and press the "A" button. Return to "My Xbox" to view your Gamer card, which now has the "Call of Duty 4" image on it.