Saw an exhibition of Julie Mehretu's work at Louisiana in Denmark last week, and some of the pieces I could have spent a lot more time staring at. The layering and lines seems pretty chaotic, but you may dig it.
Seems she has a permanent exhibition at The Project in NY for those interested.
http://www.columbia.edu/cu/museo/5/5/mehretu/index.htm
http://www.elproyecto.com/
These images don't really do the detail justice.