It would be possible, via a simple database, document template and mail merge to create personalised celebrity Christmas cards to the general public. The idea would be to submit your name (or a friend's) and maybe a personalised message to a website, then after a certain cut-off time or number of entries, the celebrity has cards printed with those messages, signs them and mails them. Perfect for living in a delusional world where you have personal contact with celebrities!
Mokalus of Borg
PS - Or for passing veiled personal threats to your enemies.
PPS - It would definitely be a problem keeping that database free from spam.