Richard Feynman:

Desiderius Erasmus ("In Praise of Folly", etc):

Bill Gates:

Franklin Delano Roosevelt:

Richard Nixon:

Doodles are used by many to awaken associations and formulate ideas. Apparently the mathematician Henri Poincare would often write out simple mathematical proofs for similar purposes.
PresidentialDoodles.com
Feynman Doodle
Bill Gates Doodle
Erasmus Doodle
Technorati tags: art, doodles, creativity, brain
A different type of doodling, but one of my favorites, is by Dennis Hwang, the person behind the Google Doodles.
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