Using gtk themes

From Fluxbox-wiki

Where to get GTK themes

You can get GTK themes from for example FreshMeat's GTK section

How do I install these themes?

You only need to untar those themes under ~/.themes, so first

mkdir ~/.themes

and then

cd ~/.themes
tar -zxvf theme-name-here.tar.gz      or
tar -jxvf theme-name-here.tar.bz2

Make sure you check the readme for what engines the theme needs. You can most likely install them through your package manager, like

apt-get install gtk-engines-industrial    or
apt-get install gtk-engines-*         or
emerge gtk-engines-industrial

You should get the idea.

And to use them?

Get gtk-theme-switch (note that there is also a version for GTK2) or gtk-chtheme. Then just fire 'em up and you should see a nice list of all styles. Just select the one you want to use and click Apply. You can also use LXAppearance to change the gtk-themes.