Using iterm2, you can set a "badge" (large text overlay) on a terminal tab. I have a short shell function (`ib foo`) that sets the badge to arbitrary text. It's NOT as good as setting the terminal theme, but it's still very helpful to use it like this:

    ib production && ssh production-machine
    ib demo && ssh demo-machine

It's definitely helped me when testing a fix on a demo or staging instance, and has helped me avoid doing it on production accidentally.

That's true, but depending on the configuration it may benefit all future users of the server.