Where can I get gamers wallpaper for home decor?

I want to make a "gamers" room for my boy n his bro. They love xbox. Between them minecraft, skylanders, FIFA n randoms! Want it to be a whole wall rather than "wall stickers" n appliqué! Anyone know where I can get some DIY wallpaper for walls or recommend someone who can do it in west mids (Shropshire)? Websites are highly welcomed.