Anyone have a good methods of doing rockwork?
“Rockwork” is a bit vague and does not necessarily suggest a specific tool or a method.
Please try to describe your objective in terms of the specific geometric form you are trying to create. Whether that is then painted with a rock-like texture or an oatmeal-like texture is another consideration.
Check this out from Daniel Tal’s 2014 Basecamp presentation:
This forum doesn’t quite seem to honor time-stamped YouTube URLs, so you may manually need to scrub to the 17:25 mark.
Some rockwork examples using SU native tools linked on this page https://sites.google.com/site/sketchupsage/tweak/push-pull.