Maybe not necessarily a great movie, but a very inspiring one would be "Beyond the Black Rainbow". It barely has any story, but a strong visual style and some interesting ideas on the side.
Another imaginative movie i recall would be "marebito", perhaps the best Work of "The Grudge" Creator Takashi Shimizu, but be warned, it is an incredibly uncomfortable film that is always right between creepy and "creepy".
Also, see "The Fountain" and listen to it's incredibly soundtrack for the rest of your life.