Odd you mention multi replication bikermouse...I have been trying to do a convincing lawn by that method to no avail for bout a week now. It's holding up my next post sumpin' awful.....
There's a fine assortment of grass types in the default veg dir and I'd like to do 4 or 5 populations all told to get a random look. I've done this in other apps but in Bryce , as I understand it, you load a grass object and go Edit>Muliti Replicate and I set it for 100 say and leave everything else alone so they're all be allegedly oriented the same way and the same size.
Next I select 2D Disperse amd I move the double arrow to the right and by gum they do disperse but in all manner of different sizes quite against my wishes....wtf am I doing wrong...sigh...waiting on pin n' needles for the answer....LOL

 

Once in a while I look around,
I see a sound
and try to write it down
Sometimes they come out very soft
Tinkling light sound
The Sun comes up again