Does anyone know of a package that lets you clearly define (lets say by a nice obvious coloured icon) which server you're using in the back office?

We currently run QA/UAT/Production servers for one of our main Umbraco projects and there's some concern from QA that it would be all too easy to make changes to the wrong node if not paying enough attention to the URL.

I recall there being something along those lines but I couldn't find anything and I am now thinking it might have been a thread about UaaS.

Thanks Martin