Another excellent clip art manipulation on Tom's Rapid e-learning blog: how to create characters with a hand-drawn feel:
  1. Select a cartoon-style clipart
  2. Ungroup and strip out background elements
  3. Copy and paste as PNG
  4. Apply PowerPoint 2010's new pencil sketch filter (or use Photoshop's)
  5. Increase brightness, soften contrast a bit.

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