Advice on Captain Nemo style artwork to use as aquarium backdrop?

Greetings all!

Well, having had my last freshwater tank since 1985, I recently got a
very cool new one (it is an 'isosceles trapezoid' shape) and am now
working on decorating it. Ideally, I'd like to utilize a backdrop
with some kind of a Jules Verne/Captain Nemo/Nautilus type of
underwater adventure theme. If anyone knows where I can purchase such
a themed backdrop, please let me know. However, as is often the case,
the product I want probably does not exist, and thus I'll have to try
to make my own. That being the likely case, can anyone recommend any
online sources of Verne/Nemo/Nautilus images I can scavenge for this
project?

Also, if I decide to drop the Nemo idea (which I may well do) can
anyone recommend some good online sources of aquarium backdrops that I
can peruse in search of something interesting? A site which has a
gallery of a wide range of backdrop themes and styles would be very
helpful.

Thanks in advance for any advice!

Chuck