It would be nice to have VisualUserKey option that would have the same effect as VisualHostKey but would show randomart for the user key I'm using to connect. Not really a security improvement I guess, but in situations where I have more than one key and I should be using different key for different host, developing sense of how my key "looks like" could make it easier to see possible problems with my configuration (eg. why my key is being refused?).