Mosaickr allows you to create mosaics—those pictures made from miniatures of other pictures—using your Flickr photos. Obviously, you need to have a Flickr account to use the app. You can use your private photos, or those available to the public. To create a 'mosaick' you'll need to select a master image such as a portrait and add images to create tiles. Once your mosaic is finished you can download a high resolution version for a small fee or have one of Mosaickr's partners print it as a poster. You can make as many mosaics as you'd like at no cost.