Find the project <a href="http://sourceforge.net/projects/gollage/" target="_blank">here. Download the tar ball and install it. Description of the application is:
GTK+ collage, in short gollage, is a program to generate photo collages with a Polaroid photo frame. The photos will be place on the final image in randomly order. You can specify the degrees, the size of the photos and the final background of the image.
It is a very simple to use GUI application.