These are just some random experiments within 3ds max.
This is a sss (sub-surface-scattering) material test. Kind of like skin, or gel of some sort. Looks nice, but takes a while to render and setup.


This is an Ivy grower from guruware.at. Very cool and easy to use. Setup is fast and it generates quickly.

This is a grass test using the particle systems (which are incredibly powerful and pretty easy). Basically model a few blades of grass as simple poly's and scatter them on a surface using a particle system. This can be done for trees, rocks, basically anything.