I flew business class Etihad LHR-Abu Dhabi-BKK last year, and gained 20k miles. As I was unlikely to use those miles in the forseeable future, I was happy to find that you can use your miles to buy goods on the Etihad webpage.

I got a totally free pair of excellent Ray Ban sunglasses...and guess what, they arrived 2 (yes TWO) days after ordering them online all the way from Dubai!

Excellent service! (And the flights were mostly good too).