Bizarre, Surrealistic, Whimsical, Weird

This may be in terms of storytelling/narrative (tone), the mood of the cinematography (atmosphere) or both. In these films there's usually an abundance of visual symbolism and metaphoric storytelling. Most would classify as 'arthouse' features, but there are also some genre films that fit the bill. The more 'artsy' type of pictures are at the top of the list.