I like pretty much all of them that had a reflection theme, which was by far the majority, I think people whether intentional or not, used the last days of 2017 to reflect on life, and that showed in all the reflection pictures.

My favorite is "Time to shine" by @scottdphoto.
The palm tree not so much the sunset, not so much the reflection, but the palm tree, so much like a phoenix getting ready to take flight. An ominous omen for 2018, or a new birth of life for 2018, we as individuals decide.