Just to give everybody a heads-up: maintaining multiple themes here suuuuuuuuuuucks. So, my intention is to either find a single theme that has light and dark modes, works decently on mobile, etc. and focus on that, or a theme that comes in light/dark versions and, likewise. That way, I don't have to come up with novel changes for each theme whenever I want to add a feature that isn't baked into a plugin, or make slight visual adjustments.
I still want to have a silly Y2K theme but that might have to wait.