SSH key fingerprint is shown by running this command:
ssh-keygen -lf /etc/ssh/ssh_host_rsa_key.pub
and the fingerprint is some strange code. Is there a way to turn this code into an image hash or something like Gravatar?
If you want an image, I don't suppose you've tried Just Doing It with Gravatar:
Ooohhh... I like it! Triforce action!