Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Low Poly Trees (160 prefabs) Free.
Low Poly Trees (160 prefabs) v1.0
10 base models in 8 different color combinations! Each of which comes in two states: Standing and cut down!
A grand total of 160 prefabs! They all share a single 32×32 diffuse map!
For only 2 bucks!
Please see screenshots to see how they look under different lighting settings.