Go to your favourite people watching place. It could be a park, coffee shop, the mall, train station - wherever. When you see someone interesting write a three sentence bio for them. Get creative! Here are a couple examples:
Steve is an ex-firefighter. He enjoys playing Scrabble and grooming poodles. Secretly he wishes he could do the tango.
Marcia loves cowboys and lemon meringue pie. In grade school she won a spelling bee contest. She has never learned how to walk in high heels.