by karashata on Mon Nov 14, 2011 7:22 pm
I can't see any reason the icon themes shouldn't work, though some older ones no longer being actively worked on may not have the symbolic icons for the GNOME Shell (though in those cases I believe the Shell falls back to the full-colour icons anyway, so it shouldn't be a problem). The GTK2 themes should work fine as well for GTK2 applications, though if they don't also have GTK3 themes associated with them the GTK3 applications will probably default to the built-in, Win95-esque theme.
You must have a lot of themes that are still being actively developed and have had GTK3 themes added to them, I know the theme I used to use before GNOME 3 (Shiki-Colors) doesn't have a GTK3 theme and, while GTK2 applications were themed without issues, GTK3 applications were not and defaulted to the ugly built-in theme.
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