Stock images are the means by which those of us without photographic talent can find great images to decorate our blogs. While many sites charge for the right to use that picture of a tangerine on a plate facing the beach at sunset, there are a vast majority out there that do allow free access to free stock photos that aren’t grainy or out of focus.
The only thing you’ll need to pay attention to, however, is reading their licenses. Though free, some have stipulations that require attribution. So long as you don’t mind that, the free stock photo world is your oyster