Artist Joe Hogan and Mike Vasquez's crossover series are the best example that Adventure Time and its style is just perfect for mash-ups. Their latest piece has really serious and funny-looking Game of Thrones characters.
Here's the full piece. It's easy to recognise everyone.
And here's a bonus, Smash Bros X Adventure Time. That's a weird Donkey Kong:
Game of Adventures by Joe Hogan and Mike Vasquez [DeviantART]