I understand that the goal of two authors coming together to write a book is to generally make it feel seemless, but the idea of reading a book that feels like a mash-up has always been appealing. Bonus points if the book feels very different depending on who's writing it.
An example would be Good Omens. If I were to think of a movie as an example: it would be From Dusk Till Dawn. The movie to me feels like a distinctive crossover even if it doesn't mesh perfectly.
If I were to make a genre preference, Science Fiction or Fantasy would be preferred but I'm willing to try out other genres, so feel free to list them, too.
I hope that what I'm asking for makes sense.
by FernandTheFresh