I reley on sketchbooks (or sometimes napkins or the backs of old envelopes) to cook up new ideas, or refine images already in progress. If you're like me, you're curious about someone else's creative process, especially their starting point where they invent the new big thing. For me, I've settled on two kinds of sketchbooks to help me loosen up my thinking--and enhance my intuitive drawing skills.

I've described each, with a few sample pages: