This is a link to a clip from a series of animated shorts called "The diary of Tortov Roddle. " By Aru Tabibito no Nikki. I enjoy its illustrative aesthetics as well as its often surreal content. The series has only 6 episodes and is only about 15 minutes of total time, but it is definitely one to watch.
This is a link to a short animation called " Black Hole, White Hole." by Istvan Orosz. He employs a monochromatic color scheme, very sketchy looking aesthetics, and plenty of almost acid-culture illusion moments when one scene transforms into a completely different and irrelevant scene.