art recommendations.

Stuff that looks good consistently. Plot, dialogue, etc are irrelevant.

Hellsing did this. Elfen Lied did this in some episodes. Berserk does this often. Texhnolyze is based upon this. Serial Experiments Lain defines this. Cat Soup defines this.

The anime named are beautiful, and I'd love to see more like them.

Gankutsuou is good for this during the first few episodes but unforunately, becomes 'normal' after the three-quarters mark.  Same with Technolyze.  Platonic Chain had fairly good CG I think... and Honey & Clover looked visually beautiful to me all the way through but that's in a shoujo way.