Doritos is getting in on the corporate sponsorship with the Xbox 360 by sponsoring a free theme and picture pack. They are available only in the U.S. and available on Xbox Live Marketplace right now. Details below:

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Name: Unlock Xbox Picture Pack
Dash Details: Doritos offers gamers a chance to personalize their Gamer Picture with the free Unlock Xbox Gamer Picture Pack

Name: Unlock Xbox Theme
Dash Details: Doritos offers gamers a chance to personalize their Dashboard with the free Unlock Xbox Theme.