For the last month or so I've been using the images on Wikipedia which I've been attributing to the provider in accordance with the instructions. However I've just found an article on the Coastal Creative Reprographics website which gives links to seventeen other places where I can source copyright free images for nowt.
So today I bring you a beautiful picture of silvery fish. I don't have to tell you that it comes from the Pixabay website. With 270,000 free images it's the biggest featured.