Ooooh, YES, AU FICS! I think that right now, if you like AUs, tumblr seems to provide the most with manips. I'd love to see more AU fic, like you mentioned, but I've seem some fantastic AU manips floating around tumblr. Try justdramione, if you haven't poked around tumblr yet. That blog, which is run by musyc, links to the original manip artists as well, so it's a good way to find manip artists on tumblr. :D