You can make custom Xbox 360 dashboard skins if you want to, you can find a couple of tuts on youtube. Just search "custom xbox 360 dashboard skin"
I think he means skins for the minecraft players, not dashboard skins But I don't there is anyway at the moment, correct me if I'm wrong.
I wonder if you could load the DLC content onto the PC somehow and edit the skins in Photoshop or something...... :fail: Derp.