In order from most to least interesting:
The Bookworm - has all the makings of a classic urban legend-type story. Gorgeous art.
Spiritual Medicine - interesting surrealist storytelling. The ending has you questioning the rest.
A Circus Tale - actually quite tame for a Hideshi Hino work, and heavy on the fantasy and dark humor. Still, pretty entertaining and creatively drawn.
Detestable Picture Book - has some good twists and turns, and quite a lot of gross imagery if you hate bugs, but it's sometimes difficult to make out what's happening to whom.
Snow White - standard Junji Ito fare, with a twist on the seven dwarves bit but not much else. Among his works with original and fresh ideas, this is forgettable and seems like it was done in a hurry.
The Story that Ends with the Prologue - this seemed written in a rush, without much planning, and reliant on a gimmick that didn't pay off.
(The other two haven't been scanlated at the time of writing this.)