Running LXDE/F16, I have only GTK apps, but some are already ported to GTK3, some are still GTK3.
My problem is I have different apparence for them (Left: GTK2, Right: GTK3)
I'm looking for a GTK3 theme packaged in Fedora so that I could install it and have the same apparence.
Being a former Ubuntu user they have Radiance/Ambiance themes that have the same apparence in GTK3 and GTK2 apps:
Ubuntu, Fedora: the same
sudo yum install light-gtk2-theme light-gtk3-theme
and then in "Menu" -> "Preference" -> "Customize look and feel" use "Radiance".
And I'm done!