While looking for something else, I accidentally came across a database of cognitive metaphors: http://web.archive.org/web/200807180217 ... metaphors/
This gives a long list of standard metaphors with examples. A couple of my favourites:
IDEAS are FOOD: That class gave me food for thought. His idea was half-baked. He insisted on sugar-coating his warnings. She has an insatiable curiosity.
PEOPLE are PLANTS: She's a late bloomer. She is in the flower of youth. She's let herself go to seed.
Any favourites? Any ideas how to exploit this in research?