Argentina's Constitution was heavily inspired by the US Constitution. Recently, the biggest piece of Argentine legislation passed in decades was authored by the members of Argentina's Supreme Court, and later submitted to its Congress, which passed it.
I know that, in theory, and in practice too, any citizen can draft legislation and propose it to a member of Congress. However, Supreme Court Justices are not just any citizen. I cannot imagine a US Supreme Court Justice drafting a bill and sending it to Congress. Has it ever happened?