Movement and interaction is a important part of an immersive world so we started adding wind and player interaction to our foliage:
Our system uses vertex color to drive the world position offset of the material, very similar to what you can find in the unreal engine content examples.
The reception of the breakdown for the landscape material we did yesterday really surprised us (in a positive way). Please let us know if you are interested in more content like that.
-Lukas