In the early part of 2021, I began building my own rig from scratch, following some tutorials for the parts that are well-known and understood. This is where I began my experimentation with shoulders, elbows, knees, and hips. I would go from normal Rigify-like setups to something completely different!
To help distract me from this tedious affair (trust me, inventing your own shoulder rig from scratch with no tutorials is awful) I did some modeling of an environment for them.
Here I am testing the shoulder setups with my "old" Princess Verachantesse mesh, and "new" Annya-Leona mesh. The rigs would have been different at this point, possibly even quite different.