Maya Brushes!

This week I am in charge of environmental modeling.  I was wondering how to model trees and whatnot when I found out a really cool feature of Maya!  Yay!  They have paint brushes, like that of Photoshop!  What does that mean?  They have environmental brushes!  I can paint a tree directly onto a scene!  They even have a moving grass brush!  There's even an option telling Maya to turn these into actual objects!  Hopefully we can use these.  If not, then I will make them myself.  I saw no rock brushes, so I'll make some rocks =D