I think that it would have been neat if a movie had been made for The Katurran Odyssey, a children's book published in 2004. It styles itself off epics like Dinotopia and Redwall, with complex lands and themes throughout the journey; I especially appreciate the detail that was put into making the different animal species realistic. And the imagery is just stunning. It would have made an incredible animated film in the right hands, though I'm not sure exactly who. Ghibli, perhaps?
On a related note, it would be nice if the Dinotopia miniseries had actually been done right. I loved the original books, and I hated how the tv producers tried to make Dinotopia edgy. I think it would work really well as a slice-of-life story, sort of along the same lines as Aria or Yokohama Kaidashi Kikou. Would be interesting to see if, in another world, the new renditions did proper tribute to the series.