More to explore:
Black and neon green birthday cake topped with a video game controller for an XBOX themed party by Simply Sweets, via Flickr
X-box - Xbox Cake SEBASTIAN O RAUL ANDRES
XBOX cake - For all your cake decorating supplies, please visit craftcompany.co.uk
Xbox cupcakes. There doesn't seem to be directions, but I would assume you could replicate this with fondant icing.