In the Version 10 Admin client you don't select which environment at log on. The environment is displayed on the upper left, but it's easy to not notice that you are in the wrong environment. In V7 & V9 I made custom Logos in the Theme setting, but those no longer display in V10.
I would like the background color of the header bar to be different by environment. So production can stay the IBM Blue, but Dev can be green, QA Yellow.