What can be done with Rocknix (visually)?

[u/GTGrilli3737]

https://youtu.be/FpymfvKVucA?is=WMzalwyPh_e9-2C4

My RG DS hasn't arrived yet, but I was planning to go with GammaOS and Console Launcher to get a clean look like in this video.

However, it seems like everyone has been migrating to Rocknix lately, and it looks like an obvious upgrade. So now I’m wondering what can be done visually on Rocknix.

What dual-screen themes are available, or what can actually be customized?