Shell is bash.
The theme is configured in the ~/.spectrwm.conf file. All I did was increase the border width (3 px I think, on the laptop right now) and decrease the contrast so the active window has a different look -
for the gtk apps, I'm using one of the Xfce themes included with the Xfce spin of Void - there are some nice ones in there that don't get borked by gtk-3.
Distro courtesy of VastOne of course! Best of the best. (IMO)
I hear ya; loving Void, but missing VSIDO - I'm going to have to set up a dual boot or VM.
And fluxbox still the go-to wm: