Recently in the 'Teaching English' magazine, Brian Hanney criticised the quality and nature of photographs in the Leaving Cert Language paper. He pointed out that a real opportunity was being missed.
A great resource is the current Guardian/Observer '100 Years of Press Photographs' series, which they've been issuing as supplements over recent days. Sunday's Observer featured the most recent decade, and there were lots of good examples of prompts for compositions, such as Thomas Hoepker's 'New York' (young people sitting in Brooklyn while the Twin Towers burnt) and Ashley Gilbertson's 'Falluja, Iraq', as the shadow of a US marine falls over a wounded Iraqi soldier.
Some of the photos can be seen online in a slideshow here.