Hm...I was imagining Grimjet's pirate ship being on the back of a flying Humpback Whale because it just seems so silly and awesome at the same time. It's amphibious and aerodynamic.

[hider=Whale Ship][img]https://s-media-cache-ak0.pinimg.com/236x/f0/b0/4b/f0b04b851a779eee6ad1ccd5cbd380b4.jpg[/img][/hider]

It would be great for getting around, ship battles, shanties, and parties. :hehe