Starting today through May 18, the original "Birthday Skin Pack" and a new "2nd Birthday Skin Pack" are free. Those will net you characters from Halo, Fable, Banjo Kazooie, and Viva Pinata. If another skin pack strikes your fancy instead, all of those are 50% off through this weekend, with the notable exception of Marvel characters.
Steve Watts posted a new article, Minecraft Xbox 360 offering free and discounted skins.
Minecraft is turning two years old on Xbox 360 today, and it's celebrating by offering free and discounted skin packs.