new in solid angle → arnold in version 5.1 is, among other things, the toon shader. arnold, famous for its photorealism, offers, as a side effect, some cartoon rendering options. the amount of detail is amazing, as shown in the image above. note the ultra thin silhouette of the border parts of the gemoetry.
below you see a detail from the torso front of the runner where another runner in the scene appears as a cartoonish reflection. i modeled the holes in the character with mainframe north’s plug-in for maya → prosets.