Alternative options to signify qube ownership of windows/widgets/... (including more colors) Qubes OS Summit 2025

My personal quest of implementing alternative approaches to the default 8 labels (colors):

Tools to create/manage additional label colors (and why it matters).
Alternate icons for the App Menu.
Alternative effects to the default tint (overlay, thin/thick borders/untouched/invert/compositor).
Sending window of specific qube to designated workspace.
Alternate border styles (solid/dash/dot/...)