A friend showed me all the awesome things you can do with them a few weeks ago, so I downloaded one and have been having a great time enhancing some of our images. The one I got is a free app called Pho.To Lab, which you can upgrade for $4.95 to remove the ads. It does collages, takes away red eye and has various filters and pictures that it automatically cuts and pastes your picture into. It's a lot of fun and a little bit addictive!