Bryce 5 handles complex models like this grass slower than Bryce 4, but the addition of the 'depth of field' more than makes up for it. This is one of my more popular images. The grass in the foreground was even used on a Canadian postage stamp.
Bryce 5's trees refused to work the way I wanted, so I used complex models in the solid glass spheres instead. This turned out to be a mistake. Due to the intense reflection depth rendering, this took a week to render.