Website Kotaku has this gallery of Japanese Imperial warships made out of sushi. The ship were made by Mayuka Nakamura as part of her graduate work at the Aichi Prefectural University of Fine Arts and Music.
There is a popular type of sushi called "gunkan maki" or literally "battleship roll sushi", which is how ikura and uni are typically served. Nakamura took that imagery and went one step further.
What makes the work so interesting is that, as Nakamura pointed out, who would say traditional gunkan maki resembles battleships and destroyers? So she decided to make sushi that actually did.