Here is the complete list from Major Nelson of what went up on Xbox Live Marketpalce yesterday:

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Themes
Content: Sparta Theme
Game: Team DZN
Price: 150 Microsoft Points
Membership Tier: Gold Silver
Availability: All regions
Dash Text: New Sparta Theme from Team DZN. There are no refunds for this item. For more information, see www.xbox.com/live/accounts.


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In Game Content
Content: Benikage's Costume The Dojo
Game: Rumble Roses Double X
Price: 80 Microsoft Points
Availability: All regions
Dash Text: