I also wanted to add some roundness to logs & nether stems (as well as their stripped counterparts) so they look more like tree trunks should. It’s using the normals and AO only, I didn’t alter the heightmap because of the issues it would cause at the seams.
You can see this new effect in the screenshots below:

Nostalgia v3.0 
KappaPT P4 
KappaPT P4 
KappaPT P4 
KappaPT P4 
KappaPT P4 
KappaPT P4 
KappaPT P4 
Continuum 2.1 alpha build 12 
Continuum 2.1 alpha build 12 
Chronos v4