I'd recommend Catherynne Valente's The Night Garden.(for an odd recommendation) It's a book of fairy tales with a frame narrative. It's gorgeous. It's almost like prose poetry, she uses metaphors and similes like bread and butter. It's like a Russian nesting doll with stories within stories.

For a less crazy recommendation: Dust of 100 Dogs by A.S. King.

(I can't seem to think of more mainstream fantasy books at the moment)