Instructables user lizzomarek made an amazing model of the castle from the anime movie Howl's Moving Castle. It's made in the Japanese pottery tradition of raku-yaki and given a steampunk flair. There's a really neat video about halfway down the page at the link showing the castle, still glowing red hot, coming out of the kiln.
Link via Make
Previously: Two models of Howl's Moving Castle in paper
Seems painting things copper makes them even more steam punk? :/
...redundant?