eltpics is a free photographic resource for teachers, created by teachers (crowdsourcing). All photographs are creative commons, so if you want to use them, all you need to do is credit the photographer. You can find the eltpics resource here.
The resource was created in late 2010 by Victoria Boobyer, Carol Goodey and Vicky Loras. From Spring 2011, two more curators joined the team: Fiona Mauchline and Sandy Millin.