Nerdio UI colors

Maybe I can't locate it, but it appears the ability to choose colors and other items were replaced with just a “light” and “dark” theme. Maintaining dev and prod Nerdio instances it was nice to set Prod to one color (ex Red) and leave dev environments another color (such as green/blue). That way it was easy to quickly tell which instance or others you were in. Can this setting be re-added or a little more customization be added?