Fellow Flickr user Mike B Newton has a fun app out for the iPhone called Collage Frames Shuffle. Like Diptic it allows you to place a number of images into a rectangle.  Unlike Dyptic you start by selecting the images you want to work with, be they live from the camera, an album, Facebook or Flickr.  You then “shuffle” the photos layout until you find one you like. Finally dragging the photo in each frame element allows you to centre them in the way you’d like before exporting to an Album, Email, Facebook, tumbr., Flickr, twitter or instagram.

There’s also a Collage Frames Shuffle App Flickr group for showing off your results.