Create poster with the photos! Now to make it it is very simple!
GIMP version 2.4 or higher supports the Photoshop .ABR brush format! Files must be copied to the directory /gimp-2.x/brushes/ (where x=version number) or /usr/share/gimp/2.0/brushes/.
Gimp Brush - prints well and if someone is handy. You can make interesting effects to photos.