I bought this one here as it's the most minimal and matching design I could find.
Belkin Rotating Universal In Car Air Vent Mount Holder for Smartphone - Black/Silver
https://www.amazon.co.uk/dp/B00O5JAR..._A.fezbV5KJKRX
Funny, my brither in law thought the mount actually came with the i8 because it matched the interior so well when mounted onto the air vents. The silver is almost exactly the same shade!