Peggy Walter has a tutorial on
using these empty presets, which I
found invaluable, the link to her site
is on the Related Sites page.

Here below are the empty Bryce
presets individually.  The Trees
preset is not empty since that is not
possible, it just has the basic trees in it.

All Blank Presets zip file

Empty Bryce preset files can
be invaluable, click here to