December 2, 2013
I don't know if it's my favorite of all time, but the first one that came to mind was "The Game" by Diana Wynne Jones. The scanned images don't really do it justice -- it's gilded and shiny, and surprisingly 3-dimensional. I personally love constellation/space-themed images, and I admit that I bought this one based on the cover alone.
I am a recent MA transplant who likes to read fantasy novels and then get angry about the parts I didn't like.