Mobli is a camera app/photo sharing service that does a lot more than everyone's current fav Instagram. There's channels that allow you to see pictures from people, pictures by places and pictures tied to a topic/current event.
Half the fun in taking pictures is sharing, right? Well, Color for iPhone and Android makes sharing all the fun. Except, you don't get to choose who you're sharing with. There's no friending, no following, no privacy—just automatic sharing to the people around you.