Konami's staff artists produced some pretty great artwork for the manuals packaged with the NES, SNES and Genesis game, TMNT: Tournament Fighters. Unfortunately, I couldn't find immaculate scans of every piece, so instead of highlighting just one, I'll give you a gallery of them all.
Here are the best images of the box art Google and Bing could provide (basically, not very good):
Here's the character artwork:
And here are the Turtles doing some moves plus some poster art (used as the cover for the Japanese box, pictured above):
This game rawks, by the way.