The folks at Blogger (a Google product) host many, many blogs, including this one. A goodly proportion of those blogs often post photos or other images. I'm not sure how many images get posted each day, but it must be tens of thousands.
Someone at Blogger had the brilliant idea of creating an unending slide show from these images. They did a bang-up job of it, too – you can vary the rate at which the images are changed, you can choose whether or not to show the associated text, and you can even click to go visit the blog that posted an image you see. I found this site to be strangely addictive. Some of the images are very beautiful; some are puzzling; many are entertaining in various ways. In a half hour of watching them, I was compelled to go visit a dozen or so new blogs I'd never heard of, and several of them are now on my read list.
Give it a try!