Designing theme icons

Hello everyone!

I’m working on a theme to submit in the next application window, but I am confused by the rule saying that “all icons must be designed”. I understand that all application icons must have a unique design and maybe the icons from the settings menu for each setting category. Does it include the icons such as the weather icon, the search button in contacts, the 3 dots for options or the icon for the call in messages screen? How could that be redesigned apart from changing its color?

Any advice is welcome!