How to make snow on objects in Bryce. If you have questions, send me a mail.

Here is the resulting image.
For the base I made a symetrical lattice and loaded the grayscale image below into the pict window of the terrain editor. You can see the result in the right image
Then I made a copy of the grayscale image in Photoshop. Next I darkened the image and brushed with much lighter shades of gray and a soft brush snow on top of the parts which stick out .
Then I made a copy of the object in Bryce and loaded the brushed grayscale into the pict window.
Finally I attached a snow material to the duplicated object then moved and rotated it a little bit in Y-direction.
Both objects together.
A second example. The fence of the image. It's the same method but in the last step I only moved the duplicated object above in Y-direction and did not rotate it. I flattened all fence objects otherwise the fence would have been two meters thick.