If you're a fan of "20,000 Leagues Under the Sea" have I got a weekend project for you. Head on over to the Disney Nautilus Blueprints Files site and take a look at the wonderful technical drawings of Nemo's (and Harper Goff's) creation available for download.
The first thing I thought when I saw them was "These would look awesome hanging on the wall." With an hour or two of effort, some aged paper, an old frame, and some trimmed matte board you'll have an eye-catching piece. Even better, you'll have a bit of "steampunk" decor that doesn't involve slapping together some brass lamp fittings and calling it a work of art!
But you could always glue some unnecessary gears to it if you simply can't resist.