One of my early favourite openings was the Chigorin Defence with 1.d4 d5 2.c4 Nc6!?. I started playing it after seeing it recommended in Leonard Barden’s The Guardian Chess Book. And I then played it throughout my teenage years, long before Alexander Morozevich discovered it.
The Chigorin is a sharp and lively counter attacking line which has much in common with both the Gruenfeld and Nimzo-Indian. There have been some developments since Morozevich championed it, but by and large it will tend to surprise White players.
Here’s my Youtube clip about the Chigorin Video at Tiger Chess: