How you change you gamer picture in xbox 360?(not using the ones you have on the xbox?

I was wondering how to put a custom gamer picture for the Xbox 360How you change you gamer picture in xbox 360?(not using the ones you have on the xbox?You can take a picture with a webcam that is attached to the xbox, or buy the pictures from xbox marketplace. Its not really that much choice because if you dont want a default you are going to have to pay up somewhere. PS. Unless you like Uno, the camera just isnt worth it.

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