Because Live needs yet another reason for people to create a disturbing breed of Avatar, one of of the options coming down the pipe for the Avatar Marketplace will be Gears of War themed costumes. You can become either a member of the COG or a Locust… the latter of which are not exactly human, so it makes you question why you can dress up as one.
Then again, it is doubtful that the Avatar Marketplace falls into official canon of the Gears series, but still. No word on cost, but hopefully it doesn’t require any imulsion. That would be hard to come by in this economy.