There is a collection of lines from essays by high school students. Some samples:
Her face was a perfect oval, like a circle that had its two sides gently compressed by a ThighMaster.
She had a deep, throaty, genuine laugh, like that sound a dog makes just before it throws up.
John and Mary had never met. They were like two hummingbirds who had also never met.
Even in his last years, Granddad had a mind like a steel trap, only one that had been left out so long it had rusted shut.
This one has a certain Raymond Chandler-flair:
He fell for her like his heart was a mob informant, and she was the East River.
[HT: Neatorama ]