Perhaps you don't want a steampunk shower... how about a tub instead? This one is from the home of Liz Lambert, who I know as a cool-as-anything Texas hotelier (her first project is the Hotel San Jose here in Austin). The large exposed copper pipes, the rusty feet, the Victorian tub add up to a nice mix of steam and punk.
Picture from Marie Claire Maison.
(Sorry for the sparse posting recently -- Christmas and a sick steampunklet is about all I can manage right now!)