Here are some ways to get some PoP skin cheats.  The best one here is clearly the Altair skin. I have not figured out how to sync my Ubisoft account to XBL, but I’ll work on that. Here are some codes or prompts to play dress up.

The Prince of Persia Skin and Farrah Skin for Elika, both from The Sands of Time — Unlocked by entering the code “525858542″ in “Skins Manager” under “Extras”.

Jade’s Skin from Beyond Good And Evil — Unlocked by finishing the game once. Then activate it in “Skins Manager” under “Extras”.

Altair’s Costume from Assassin’s Creed — Unlocked by syncing your Ubisoft.com account (link goes to signup page) to your PlayStation Network or Xbox Live account. Then activate it in “Skins Manager” under “Extras”.

Classic Prince of Persia Skin — Received when pre-ordering the game from GameStop.

Prototype Prince and Elika Skins — Unlocked by collecting all 1,001 Light Seeds (the last one is in the Temple’s tree at the end of the game). Then activating them in “Skins Manager” under “Extras”. Note: Shadowmask mentions this is only unlockable in the PC