I love the the “explore” features of flickr. I can drift off into a fugue state, reloading page after page of delightful photos. That experience has now been optimized for the iPhone and the iPad. Explore Flickr fills the screen with thumbnails of random (?) images. If you see one that interests you, you click and enlarge.
Depending on how the owner licensed the image, you can download it to your device. This is a pitiful little description of something you really must see to appreciate.