At first, this fan art from weregeek was just funny – oh, I see what you did there! Then, I started thinking about how the Harry Potter books would change if the main characters were from a different country. It’s an interesting thought (and good mental exercise).
Try picturing your favorite fantasy books with a different cultural base (for example, instead of a British-based LOTR, what about using cultures from Japan or Brazil?). The plot would be the same on a macro scale but different on a micro scale. A lot about the characters would be the same. All in all, it would be a very different book.
Actually, that could be a writing prompt: pick a book and a new cultural base, and write the new story. For example, take The Curse of Chalion and change the culture to the Roman Empire. Different book, right?