This is about the only thing I have been able to find to get some ideas what aftermarket rims would look like. Press "PAINT" on the top of the window to choose color.
http://www.visionwheel.com/configurators/cars.cfm#!lang=0&year=2015&make=63&model=24254&submodel=20%3AOE%2018%20WHEELS&size=18%20Inch%20Wheels&go=1&body=0&tab=wheels&page=1&wheel=2386&wheelimage=30533&color=35680
http://www.visionwheel.com/configurators/cars.cfm#!lang=0&year=2015&make=63&model=24254&submodel=20%3AOE%2018%20WHEELS&size=18%20Inch%20Wheels&go=1&body=0&tab=wheels&page=1&wheel=2386&wheelimage=30533&color=35680