Normal chains and padlocks are fine if you aren’t trying to make a statement.
Italian brand Abici has released their leather coated bike chains and matching locks. The chain comes with a butter soft leather coating. Matching the lock is also wrapped in the same leather, featuring a subtle logo embossed on it.
These are probably the most elegant way of locking your bike. With time the leather will only get nicer. The Abici bike chains are now available from Soto Berlin.