Photos for passwords?
http://www.utwente.nl/nieuws/pers/en/cont_08-044_en.doc/
Great read about using photos for passwords derived from work around getting handguns to recognise users.
"This idea of using biometrics for safe storage and transfer arose from the SecureGrip project. This is a project in which the grip of a policeman’s firearm is biometrically protected, in this case with a ‘personal grip' covered with a network of pressure sensors. These recognize the way in which the user holds the firearm. If someone else holds the weapon, it does not work."
