Behold, my artsiest fartsiest.
[ol]
Prologue Gymnopedies - A short story collection based on
a record. Neat concept.
Witches - Igarashi Daisuke might be artsy fartsiness incarnate, but this collection of witches from unusual parts of the world is well worth your time.
Nekojiru's manga are the most famous (and arguably most enjoyable) of the short-lived Japanese underground comics.
Paranoia Street - This one's just plain fun. Kago Shintaro's art might be well-known, but he's an underrated author in his own right.
Ano Ko no Ie - A slightly surreal coming of age story of a young girl running away from home and finding her space.
Nishioka Kyoudai's stuff - Aggressively artsy fartsy, and easily its worst offender on this list.
Dainana Joshikai Houkou - One of my personal favorites, with a unique style of surreal. If you like what you see, her other series Babel no Toshokan and Mikake no Nijuusei turn that surrealism up a notch, while Wakusei Closet embraces the cosmic horror of it.
Undercurrent, and by extension
Toyoda Tetsuya's other manga are all really good, realistic slow-burn stories. Not particularly artsy fartsy, but I figure it'd be well up your alley.[/ol]