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I have one of the most friendliest custom 404 pages on the internet, but don't take my word for it, see for yourself: https://deviousmalcon-t.users.sourceforge.net/404.php

Of course, the page doesn't behave like that if it's an actual 404 error: https://deviousmalcon-t.users.sourceforge.net/foobar

There is also a 403 Error page: https://deviousmalcon-t.users.sourceforge.net/403.php

I still haven't worked out what I'm gonna do for the 500 and 504 pages yet, for the 500 internal server errors I was going to use this .gif as the background: http://imgur.com/iq2w6sk however, I should read up on it, because I don't think I've ever seen a 500 error page with custom CSS3 style and the like, it might be a good idea not to touch that one...