Scottish-based Designer David Airey is a prolific and popular blogger on design. In this blog on solo brainstorming on paper, he discusses and illustrates the evolution of a logo. 

“Here are some of the pencil sketches I created during my personal logo design process. I think that overall, this constitutes around half the total sketches made (others were on scraps of paper that have been either lost or thrown away).”

[1] http://www.davidairey.com/personal-logo-design-sketches/