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VisualHostKey is a new feature of OpenSSH introduced by version 5.1. 
It seems very useful for users who need reinstall system sometime.

Visual fingerprinnt display is controlled by a new
ssh_config(5) option "VisualHostKey". The intent is to render SSH host keys in a visual form that is amenable to easy recall and rejection of changed host keys. This technique inspired by the graphical hash visualisation schemes known as "random art[*]", and by Dan Kaminsky's musings at 23C3 in Berlin.

For example:

~]# ssh 10.12.10.226
The authenticity of host '10.12.10.226 (10.12.10.226)' can't be established.
RSA key fingerprint is 9b:2a:c2:2d:41:24:b1:92:95:e6:34:48:4d:01:19:57.
+--[ RSA 2048]----+
|o*B=oE           |
|o=B.             |
|+* .             |
|. o              |
| .      S        |
|  .      o       |
| . o    o        |
|  + o  .         |
|   o ..          |
+-----------------+
Are you sure you want to continue connecting (yes/no)?

This feature request did not get resolved in time for Feature Freeze
for the current Red Hat Enterprise Linux release and has now been
denied. It has been proposed for the next Red Hat Enterprise Linux
release. If you would still like it considered for the current
release as an exception, please make that request with your support
representative.

I preffer to let this decissions on administrators.