The only thing that should be copyrightable is direct code in this case.
If you can copy something using your own work... well good.
It's a user interface, not a fictional character or mascot.
Look at the Fashion Industry, where something like 80% of the industries goal is to "Copy someone elses look."
While the other 20%'s job is mostly, "Innovate somethign new off someone elses look."








