I love World Creator, especially the vegetation distribution pipeline. You can create some very realistic fields with it. Im going to check out impostors too - ive seen it a few times and wondered what it's about.
Stupid Rental. My Zbrush that I haven't paid for an update in years and is perpetual Trumps that on all counts.
ZBrush Tutorial Create Tileable Brick Floor
In this video you will learn how to model tileable brick floor in Pixologic ZBrush. It contains tips on alphas, brushes, transpose tools and offset deformations.