Using Illustrator's pencil tool and shapes of solid color, you can imitate the graphic novel styling of A Scanner Darkly.

Illustrations for editorial, publishing and advertising

When he's not dreaming of deserted islands and coconuts, he works for book publishers, magazines and advertising agencies forpublications all over the world. Aside from his commercial work, Adrià has also designed tee shirts, done mural painting, and hasexhibited illustrations in different countries. He says life is like a coconut, hard and hairy but full of juice!

Great color use in his comic style illustrations

Digital Colouring Tutorial

Illustrator CS3 Tutorial on Gradient Mesh

THE PORTFOLIO OF CONCEPTUAL ARTIST AND ILLUSTRATOR DAN LUVISI

Pixar artist Nate Wragg's illustrations

Great site that updates frequently and features a lot of different artists