Personally, I get tired of those books with the warrior, the wizard, the thief....
Sometimes I want your fantasy to be just mind-blowingly strange. If you like that too, here's a short list of truly odd things, all of them by Christian writers, in chronological order
This is a link to a translation of the earliest Christian fantasy in English (it was written in Anglo-Saxon, and even though I studied Medieval lit, I can't just read Anglo-Saxon for fun). It's an imagination of what the cross would be thinking if it were sentient. Different times are almost like different planets.
Water Babies, by Reverend Charles Kingsley
A lot of the classic children's books are actually very peculiar--if you've read the originals of Pinocchio and Peter Pan then you know that. This is probably the strangest children's book I ever read, and I was a child when I read it too. It's about a young chimney sweep who (??)dies(??) and ends up transformed into a water baby and what happens to him.
The Back of the North Wind, by George MacDonald
You might be familiar with The Princess and the Goblin and The Princess and Curdie, but this book is a lot stranger. A young boy who is dangerously ill becomes able to see the North Wind, a beautiful woman who is possibly also in some sense death.
Sylvie and Bruno (2 books), by Lewis Carroll
Everyone knows Alice In Wonderland is very peculiar, but this is a great sprawling mess, probably not popular because it's hard to figure out who the audience is. There's a lot of elfy-welfy absurdist little kid stuff in it, and a lot of grownup discussions about theology and so on too. But I actually LOVE this book, and I think Christian anime fans might be a good audience, since they are used to having cutseypoo mixed up with the serious stuff. What's it about? Fairy children, and the young lady in our world who kind of is the same person as one of them, and the older guy who is sufficient unhinged from reality that he notices this kind of thing.
The Man Who Was Thursday, by G. K. Chesterton
Entering the 20th century, we get something that starts out like a mystery and then goes all surreal. I'm still not sure I entirely understand what the end of this book is doing, but it's different all right.
The Place of the Lion, by Charles Williams
Any book by Williams will blow your mind right out your ears, but this one is my favorite for weird. The Platonic ideals of animals become real and the world is starting to unravel. Williams is NOT for children, even bright ones.
The Man Who Was Magic, by Paul Gallico
Gallico wrote all kind of stuff in the middle of the 20th century. His most famous books are Thomasina (the famous cat book) and the Posieidon Adventure. This book is about a city entirely inhabited by professional magicians (of the stage variety) and the guy who shows up, who can do, you know, magic. Actually one of my favorite Christian books of all time, and perfectly suitable for older children. I was always getting my parents to check it out for me since our library didn't let kids check out books marked adult. But if it were published today I'm sure it would be in the YA section.